What to do in Falmouth with a 14.5 month old?

My DD and her fiancé are going horseback riding in Falmouth, so DH and I will be keeping our DGS (14.5 mos.). Originally we were going to do something in the morning and then just hang at Margaritaville.

Any suggestions of where or what we should do? I'd love to see something while we are there, but kid friendly and easy to get to of course! He's a very easy going little tyke and well travelled (Disney at 10 weeks, Hawaiii at 8 months and always out to restaurants) so this is just as much for his enjoyment as it is for ours!

TIA!

If only he were 14.9 months old. Far more options. Just kidding. Jamaica is a tough one for toddlers. Any boat ride excursions available? Most of the outdoors activities are for adults and older kids. Beaches and boat rides seem to be the usual best options. Other tours would probably be boring to him.