Grassy Flats Resort & Beach Club

Hotels
8.9 (736 reviews)
58182 Overseas Hwy , Marathon , US
305-998-4590
[email protected]

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Free
Children allowed

Facilities

Two oceanfront pools (family pool and adults-only pool with hot tub)
Direct beach access
On-site watersports: kiteboarding, eFoiling, sailing, paddleboarding
Beach Club & day passes with resort and cabana access
Oceanfront dining at The Rhum House
The Palm Deck with live music
Bales Away
Land and Sea Market
Complimentary wifi
Complimentary parking
See all facilities

Review Highlights

Pros:
Very clean
Great staff / friendly and accommodating
Excellent beachfront location
Nice pools (adult and family) / great pool
Nice balcony / great view
Relaxing setting set back from roadway
Cons:
Sargassum (seaweed) on beach causing strong odor
Hot tub not working
Espresso machine / lack of standard coffee/K-cup option

Categories

Cleanliness
9.5
Multiple reviewers called the property very clean; housekeeping overall praised.
Service
9.6
Staff repeatedly described as great, friendly and accommodating.
Location
9.7
Excellent beachfront location, set back from the roadway and close to the water; praised by guests.
Room Quality
9
Rooms/balconies received positive mentions (nice balcony); no significant room complaints.
Amenities
7.8
Pools praised (including separate adult/family pools) but hot tub not working and some amenities (espresso machine) were criticized.
Value for Money
8.9
Standard quality for this hotel tier.
Food and Beverage
7.6
Limited criticism focused on the espresso/coffee setup (would prefer standard coffee/K-cup option); no strong positives for F&B.
Overall Experience
9.1
Generally very positive — relaxing, great staff, pools and views — though sargassum on the beach and its odor noticeably reduced enjoyment for some guests.
* This sentiment is summarized by AI based on user reviews.
Updated at: 2026-10-30 19:33

Property Description

Grassy Flats is a family-owned, eco-friendly boutique resort on Grassy Key in Marathon, Florida, with direct beach access, two oceanfront pools (one family, one adults-only with hot tub), an on-site Cabana Crew, world-class watersports (kiteboarding, paddleboarding, eFoiling, sailing), and oceanfront dining at The Rhum House, The Palm Deck and Bales Away. With three buildings and seven room types, every room has an ocean view. The Wreckers House and Humidor House are adults-only (21+) buildings; the Conch House offers fully equipped family suites with full kitchens.

Important information:

Guests are required to show a photo ID and credit card upon check-in. Please note that all Special Requests are subject to availability and additional charges may apply.
Please inform of your expected arrival time in advance. You can use the Special Requests box when booking, or contact the property directly using the contact details in your confirmation.
Guests under the age of 18 can only check in with a parent or official guardian.
A deposit may be required at the property.

Check-in and check-out hours:
Check-out: 11:00 AM
Airport code: EYW

Property Policies

  • Check-in / check-out

    Check-in from 16:00:00, check-out until 11:00:00.

  • Minimum age

    Guests must be at least 25 years old to check in.

  • Pets

    Pets are allowed; charges may apply.

  • Important information

    Guests under the age of 18 can only check in with a parent or official guardian.

  • Payment

    Payment: pay at the property, pay online later, pay online now.

Location

Guest Reviews

8.9
Based on 736 reviews
Cleanliness: 9.5
Service: 9.6
Location: 9.7
Room Quality: 9
Amenities: 7.8
Value for Money: 8.9
Food and Beverage: 7.6
Overall Experience: 9.1
E
Emma • couple • nl
8
Fijn
Pros:

Het is heel schoon, de kamer is ruim en een prachtig uitzicht.

Cons:

Het zeewier stinkt nogal en er zitten veel muggen bij het zwembad.

2026-11-02 • via Nuitee
L
Locher • couple • us
8
2026-10-19 • via Nuitee
N
Nelson • couple • us
8
Great location/ great pool/Great staff
Pros:

Very clean/ Staff was great

Cons:

Hot tub not working/ Smell from all the sawgrass not resorts fault

2026-10-18 • via Nuitee
R
Rebekah • couple • us
7
Great hotel, stinky due to sargassum
Pros:

Clean, friendly staff, accommodating. Balcony was nice

Cons:

Sargassum on beach, unusable area, very stinky with piles of seaweed that needed to be removed from the area to decrease the stench. Took away from enjoying all the features available at the hotel. The espresso machine was a bit much, need standard coffee/kcup option

2026-10-17 • via Nuitee
S
Shari • couple • us
10
2026-10-10 • via Nuitee
B
Bar • couple • il
10
Pros:

המלון נמצא על החוף, הים והנוף יפים, ישנן 2 בריכות, אחת למבוגרים ואחת למשפחות, מאוד כיף.
אנחנו היינו מאוד מרוצים.

2026-10-08 • via Nuitee
M
Melissa • couple • us
9
Relaxing with a great view.
Pros:

The property was set back from the roadway and close to the water.

Cons:

The sargassum grass smelled bad.

2026-10-08 • via Nuitee
L
Leonie • extended_group • nl
8
2026-02-09 • via Nuitee
M
Michael • extended_group • us
8
Great private location scenic views overall I would go back again but probably stay in the newer section
Pros:

The property grounds were real nice good beach location very private two swimming pools a great tiki bar by one of them nice hot tub great views also a nice rooftop bar and restaurant

Cons:

We stayed in the older part of the resort which was a little dated but it was fine could use a little maintenance stupid things like paint and lightbulbs but overall it was fine if all you were looking for was a place to sleep but again that was the old section I think the newer section and the rooms that were right on the ocean looked a lot nicer

2026-02-08 • via Nuitee
L
Laura • family_with_children • us
10
2026-02-08 • via Nuitee
F
frank • couple • us
9
2026-01-19 • via Nuitee
R
Rene • couple • us
9
What a beautiful resort. The view from our balcony was amazing. Beach area and pool were beautiful. We willl definitely
Pros:

Beautiful property. Great location. Great amenities

Cons:

No microwave in room

2026-01-18 • via Nuitee
M
Margaret • solo_traveller • us
9
2026-01-13 • via Nuitee
C
Cheryl • couple • us
10
Fabulous
Pros:

Everything

Cons:

Nothing

2026-01-12 • via Nuitee
A
Amy • couple • us
10
2026-01-09 • via Nuitee
J
JADINL3 • Family • Indianapolis, Indiana
6
Beach restoration ruined the experience
Pros:

We were so excited about staying at this property based on the outstanding reviews. The experience was ruined by the beach restoration. The smell and noise made it impossible to enjoy our balcony, beach or pool area during our entire stay. I understand that improvements need to be made, but am disappointed that I wasn’t notified this would be going on during our stay. (I made the reservation over the phone) If we would have been informed, we might have made a different lodging decision.

2026-01-01 • via Tripadvisor
B
Bryan • couple • us
10
Pros:

Beautiful resort and campus. Friendly service. Room was everything we needed.

Cons:

The only constructive criticism I would offer is that the restaurants onsite were not open when we were told they would be. But I do understand this was an "off week" for much of the keys and a time when many places have abbreviated hours. This should have been communicated better. Still loved our stay and would stay again. We've already recommended the resort to others.

2026-01-01 • via Nuitee
D
d7cev15a2d • NONE
10
Beautiful views
Pros:

I wish we could've stayed longer. Beautiful view, clean room, quiet, and very friendly staff. And yes, you have to meet Wilma.

2025-12-31 • via Tripadvisor
K
kathleengK7168GJ • NONE
10
This place and staff were AMAZING
Pros:

Can not say enough about the staff from the market and the (Buffalo) butcher to the restaurant and lounge. Who can’t say enough about the office staff. Extra hugs to Oli for making Annie the happiest. Miss all already.

2025-12-30 • via Tripadvisor
T
tinasP7221UF • Couples • Detroit, Michigan
10
Perfect Place
Pros:

This is a wonderful combination of bougie and relaxing. It’s perfectly nestled in the calm waters with an excellent beach space. The two pools are great; one is adults only and a perfect place to relax.

Top that with three different food and beverage options and the best staff I have ever met; this place is a gem.

2025-12-29 • via Tripadvisor