The Best Family Hotels in Grassy Key, FL from ₩184,359 in 2026

A dolphin swimming near a wooden dock and a tree branch in the water.

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Our top choices for Grassy Key family-friendly hotels

Fairfield Inn & Suites by Marriott Marathon Florida Keys

Marathon

₩269,142 total

includes taxes & fees

Jul 13 - Jul 14

Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

Marathon

Create a fun-filled retreat where kids and adults thrive with oceanfront pools and bicycle adventures through tropical gardens.

₩335,707 total

includes taxes & fees

Aug 5 - Aug 6

Premium bedding, soundproofing, iron/ironing board, free WiFi

Knight's Key Suites

Marathon

₩184,359 total

includes taxes & fees

Aug 9 - Aug 10

Rainbow Bend Resort

Marathon

₩242,978 total

includes taxes & fees

Jul 13 - Jul 14

Captain Pips Marina & Hideaway

Marathon

Family paradise offers outdoor pool, marina access, free bikes, and endless water activities at coastal haven.

₩284,538 total

includes taxes & fees

Aug 4 - Aug 5

Grassy Flats Resort & Beach Club

Marathon

₩414,687 total

includes taxes & fees

Jul 12 - Jul 13

Conch Key Fishing Lodge and Marina

Marathon

Family-friendly fishing lodge with a private beach and outdoor pool provides a perfect coastal escape for all ages.

₩215,308 total

includes taxes & fees

Jul 14 - Jul 15

On the beach, sun loungers, beach umbrellas, beach towels

Isla Bella Beach Resort & Spa

Marathon

Discover a family beach paradise with five pools, water sports, and complimentary games for kids of all ages at this resort oasis.

₩522,653 total

includes taxes & fees

Jul 19 - Jul 20

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Choose what matters most at family-friendly hotels in Grassy Key

Breakfast included

Pool

Top Grassy Key Hotel Reviews

Captain Pips Marina & Hideaway

10/10 Excellent

"Really quaint old fashioned dock side setting and accomodation. Felt very relaxed and comfortable. Great bed and beautiful view. Helpful staff and friendly- good recommendations for food. Only initial disappointment is there is building work currently happening out the front of the property which we weren’t aware of but no disturbance from it. "

Tranquility Bay Beachfront Hotel and Resort

10/10 Excellent

"Great place and would stay again. The staff works tirelessly to make everyone welcome. The housekeeping staff is simply amazing... there are so many rooms to clean and in short time and they bust it out. The Tiki Bar food is DELICIOUS and big portions... and the drinks are great! Well maintained beach area (bring your snorkels!) and the pool is very nice. Water does get "warm" in the summer in both, but its beautiful. Location is fabulous as well. Spacious villas and has everything you need to relax and unwind."

Fairfield Inn & Suites by Marriott Marathon Florida Keys

10/10 Excellent

"Great hotel!! Very confortable!!the rooms are very clean and the hotel facilites too. The breakfast is great, many things to eat fresh fruits, yougurt and milk, is the best part for childrens!! A Great breakfast buffett!! The personal in the check in area is very friendly and give you feel great vacaciones. The ocean views was amazing, I recommend this hotel a 100% Thank you , !!!!"

Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

10/10 Excellent

"We recently stayed here and had a wonderful experience. The staff was incredibly friendly, welcoming, and always willing to help. The breakfast was delicious, and the scenery was absolutely beautiful. A couple of things to keep in mind: this hotel does not have its own beach, but guests can enjoy the beach at the neighboring hotel at no additional cost. Also, be aware that this resort charges separate parking and resort fees. Overall, the location was perfect and made for a great base to explore the Florida Keys. We had a great stay and would definitely return!"

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Our top choices for Grassy Key family-friendly hotels

Fairfield Inn & Suites by Marriott Marathon Florida Keys