You can also email the concierge to get a copy of the literature that shows the activities and their costs since that specifically doesn't appear on experienceparkhyattmaldives.com. I can upload the literature I received in 2019 (applicable to our stay in January 2020) unless anyone else has newer literature available.

I haven't see it recently mentioned, but we did the Traditional Fishing excursion and enjoyed it. It's not done by speedboat, but on a dhoni. Everyone (including the crew) had a blast. After the excursion, each person had a fish cooked for them at the dining room.