Boatsetter - Rent a boat, with or without a captain. Powerboats and sailboats, anywhere in the country.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Sailo - Airbnb for boats
Project Fixup - Meet people, not profiles
GetMyBoat - Book boat rentals, charters, tours, and lessons in 171 countries around the world.
Palaround - Meet people you should be friends with.