Many ideas will be forthcoming but it will be important to understand different points of view.
For instance Colour1 recommends the Rhino Riders. And for the younger set, they are likely a lot of fun. I went several years ago and wound up with some fairly bad back pain from all the bouncing on the waves!

My husband and I booked a private tour with Eagle tours at the height of Covid. We went on a boat with just the two of us and a captain and first mate. It was fantastic. Just a lovely way to see St Maarten.

Everyone should go to Sunset beach bar once. But the few times I have been there have been more than enough for me. The stupid people hanging on the fence during a jet take off. Do you really need to feel sandblasted?
That said, as a former flight student (never made it to getting my license), it is amazing to watch the planes landing there.