Not sure if it's post-trip for you but you can do everything, you'll just have something to do every single day. If that's not your vacation style, then reconsider adding on as you go.
I took the beginner's scuba diving lesson which is about an hour and a half. Diving after that (even for beginners) is about $60USD.
Sailing is from 1-4.
Kayaking is on your own anytime but there are instructional courses that meet at 10:15 by the dive shop on the beach.
Jungle biking rides/tours are scheduled at various times throughout the week.
The Volcano Tour/Diamond Waterfalls/Botanical Gardens tour leaves the resort at 9:00 a.m. and returns around 11:45. You can also schedule this on your own but will pay about $20USD pp extra.
The guided snorkel tour is about 2 hours and there are two tips (one around 10 a.m. and the other around 1 or 2 in the afternoon).