Yes, your list of activities is making me tired too!

As far as best bars along Orient Beach, "best" is certainly a subjective term. My suggestion is that you get there early, walk the length of the beach, looking at the menus and even chatting with the proprietors and beach staff to see which one has the vibe that you want for the day. There are three or four watersports concessions set up along the beach as well, so you can look into parasailing at the same time. Our favorite Orient beach bar/restaurant is Kakao, which also has a watersports facility, although I don't think they offer parasailing.

I second the recommendation of Gutside for authentic local food, and a great experience visiting with local residents, Richard and Lourdes.