we were on the 10 night last year we have four teenagers and an 80yr old aunt so some of the islands we split up
Aruba 4x4 Natural Pool Adv was excellent, very rough terrain lots of fun Natl Wonders of Aruba - Aunt went on this with one teenager and they both liked it, this year just taking taxi to beach.
St. Kitts road Quads which some are doing again this year, also last yr Aunt and one teen went on Essential St. Kitts w/ Fairview, both enjoyed. Teen liked it so much he is going on another this yr, Scenes of St. Kitts
Barbados never been there, taking a private van to accommodate all ages
San Juan been there a few times, just walked to forts and around town
All our excursions are thru Disney, may be cheaper to do on your own, we fear missing the boat
Hope this helps, there are also two FB groups