St John Beach & Snorkel Excursion with RC

We only have a few hours (ship docks 10 AM - 6 PM) in St. Thomas. We are considering the St. John Beach & Snorkel excursion with Royal Caribbean.

Based on reviews, there is a lot of transportation involved, so we may not have much time to enjoy the beach.

We travel with my parents-in-law so extensive walking is not feasible. However, we want to do something besides hanging out at a beach.

Anyone took this excursion with RC before? How did you like it?

Suggestions and inputs are welcome and appreciated.

Thank you.

I'm wondering the same thing.. I love St. John but with the short time and all the travel in the end is it worth it?