We did the Land and sea combo in St-Lucia and it was very interesting and well paced.The line up on the dock for this tours was fairly long, I would say maybe 50-60+ people.
**Shopping on the port is right off the ship** Within 10 minutes we were on our bus.
Our tour started with the bus (12 persons) tour of part of the island with a few stops along the way for pictures and souvenirs purchases opportunities. We bought banana ketchup! Many beautiful views of the port and the seas are breathtaking. The bus tour takes you up in the mountains. Stopped at the gardens and Diamond falls, and the volcano (stinks like rotten eggs-yuck) was nothing like i've seen before. Lunch was served once we were on board our catamaran portion of the tour. It was a nice leisure sail with one stop for 45mins to snorkel-awesome!! Water was so warm and fish colourful.
This excursion is full day so you won't have time to do much else in St-Lucia. It's a good tour to get to know the island in my opinion. We enjoyed it.