Park
At 09:30 take JR from Hakata and change at Kashii. About 11 minutes to Kashii, about 20 more to Uminonakamichi. Lunch is in the park. Park adults 450 yen and aquarium adults 2,500 yen are separate tickets. Park to aquarium is an 8-minute next stop. Turn back at 16:00 and be at Kashii before the last train. Shikanoshima is another bus.