Been a few times. All of the islands blend together
for me, but I’m pretty sure we did a zip line / ropes course in Antigua. As far as food... just manage your expectations. Generally speaking, food in the Caribbean is OK at best (with the exception of the French islands during season). There should be some good rain forest hikes. There’s also good snorkeling and/or scuba diving. Maybe look into a charter catamaran for the day (with a captain).