Port Day- water tour or land tour?

[Bucket29]

Cruising in early August, would love insight.

Port days in St. Thomas and St. Marteen/Martin. Trying to decide on which port to do water tour and which port to do "taxi/beach" tour.

Options include day of sailing and snorkeling in St. Thomas or day of speed boat and snorkeling in St. Marteen/Martin. Whichever port we chose to do water tour, the other port we would have a more modest cost day and either hire a taxi and see the local sights or just walk around. Cost is similar for both water days, equally rated for fun and reliability and both include food and drinks.

We are a group of 12. Six adults and six kids ranging 11-19. Some of group are slightly prone to motion sickness but plan to take Bovine.

General thoughts and anyone who has experienced either greatly appreciated!

Will also post under general Caribbean and St. Thomas threads

thanks