Eastern Caribbean wheelchair in ports

We're going with a group and have two people in our group in wheelchairs. I'm trying to find excursions that will accomodate everyone but having a hard time! Wheelchairs and sand obviously don't mix so I'm looking for suggestions! I don't want to leave out those in the wheelchairs but I don't want to make the others miss out on things either! Any suggestions would be appreciated!

We're going to San Juan (3-midnight), St Thomas and St. Maartin.

On RC we did an "EASY ST THOMAS" tour that was HC accessible but had limited room for wheel chairs and had to be booked in advance and marked for w/ or w/o wheel chair.