There are various facilities such as parks, aquarium, golf course, horseback riding, and swimming in the summer. I especially recommend a bicycle ride. You can rent a bicycle easily at the Uminonakamichi Seaside Park. Bicycling in the sea breeze is exhilarating.
You can take trains from JR Hakata station. It is also recommended to take a boat from “Bayside Place Hakata” in Hakata ku or “Seaside Momochi” in Sawara ku.