Wow, what a response. I just wanted to thank everyone for your advise.
Looks like I need to start booking my 2010 trip to get it all in, LOL.
I am definatley going 2 days early, in hope to get some tourist stuff done and will take a mid-week break as well.
The ruins sound amazing, I would LOVE to see them not only mid day (full sunlight) but, at sunset. I can only imagine how amazine the view is.
The zipline and dolphin swin sounds fun too.
With the clothing optional thing, I guess this leaves me with a few months to start working out and get ready, LOL.
Another question, how much different / harder is drift diving?