Let's see, I think we're going to do the zipline tour through the rainforest this time. I hear that's unbelieveable. When we went there in October, we went on an all-day tour that involved a catamaran ride, many of the touristy sites (Sulphur Springs, Botanical Gardens, Diamond Waterfall, etc.), swimming, and lunch at a plantation. Almost every tour operator offers it. We were on a Carnival boat, but I'm not sure if our resort (Coconut Bay) had chartered it or not.
Another thing we missed last time that we want to do this time is go to the "Jump-up." It's a street party up in Gros Islet (which is the area we're staying in) that kicks off the weekend every Friday night. Google it, you'll get tons of info. The Fish-fry in Anse la Raye (I think that's where it is), is supposed to be a bit calmer, but also lots of fun.
I'll think of more stuff, but feel free to ask. I cannot wait to go back there. It's just gorgeous. (Simply beautiful really is the perfect description.)
Also, if you don't mind my asking, are you in the NYC area?