Our Segway excursion was a lot of fun. Since we had been late arriving into port, the first excursion was late coming back, so ours got started late. We had used Segways in Rome, so we were all old hands at it. Someone on the excursion before ours had fallen while watching some birds, instead of where he was going, so his leg was pretty gashed up. No one on ours had any trouble at all. By the time we finished and got back, we ended up being the last ones on the ship (well, we dashed into CVS to get some laundry detergent). The guys checking us in at the ship were thanking us for finally getting there.
You dock literally in Old Town, so this is a very do-it-yourself type port.
We were glad we paid the extra for the van to take us to the Rhino Riders, it was quite a ways away. Made it very convenient. Traffic was horrible.
The Rhino Riders are zippy little two-person boats, a cross between a jet ski and a zodiac. Very stable and safe feeling, even in the choppy seas we had. These boats can move! We rode over to Happy Beach quite far away where we could have snorkeled, but the chop had stirred up the water too much. So we just swam to the beach and had fun. Stayed there about 45 minutes, then rode back.
An excellent excursion. We did not do anything else on St. Maarten, the crowds were just too much.
We took the ship's excursion to the Dolphin Encounter. This was a wonderful excursion, but depending on your feelings about this type of thing, it's not for everyone. We all loved it, but my daughter has had strange dreams about being a dolphin ever since. She a very empathetic person.