I did some research and have to bargain with my neice a bit but here is what we decided to do:
St Thomas - Shopping in the morning, then 1/2 day St John Beach and Snorkel tour - This one goes to Trunk Bay
St Croix - Salt River Kayaking and Parasailing
St Kitts - Pandora's Time Box - sightseeing, and swim at Frigate Bay
Antigua - Ultimate Adventure - Canopy Tour, zip lines, swimming, catamaran
St Lucia - Island Delights - sightseeing, includes the Pitons and drive through volcano.