yes i did read your post and noted what you said about tong nai pann.
i lived there in 1988 before i headed over to koh tao and i must say it was the best time of my life. you can imagine that beautiful bay with fuk all tourists, only a few bungalows and at that time there was only 5.
the road over the mountain was tragic, only a few back packers fronted up and had many occasions where it was just me and the locals.
i got a shit load of hard copy photos and one day ill get a scanner and do a thread on that bay in 1988. unbelievable beauty of tong nai pann with no punters around.
anyway back to koh tao.
sairee and cholok bann kao beach are all but touristed out now.
there are some awesome bays at the back of the island that are secluded , only have a few bungalows and are stunning. all on the east coast.
# 1 = hin wong bay . fan bungalows with dunny for 500 baht over looking the bay. no beach thou.
great snorkling and protected against the prevailing winds in season. much like looking up at the mountain of tong nai pann when one is in the water.
no resorts here and very low key place, only 2 bungalow operations.
# 2 = ao leuk and sai daeng bays. stunning beauty, beautiful water, good snorking both located on a small bays with awesome beach. upmarket or low key accomodation available. hard to get to because of the mountain so better to arrange pick up at the pier same for hin wong.
google these places and have a gander.