I think your going to the wrong place for snorkling, Lembeh is a muck
divers paradise, the vis is not that good, the critters are mostly on the
bottom, they are difficult to spot when your ON the bottom. The surface
water in places has lots of debris that i would not want to snorkle in.

I would not want to take a seven year old there.......try the
Maldives....or the Red Sea.

I have 3 pages on Lembeh Straits on my web site...
http://www.seatreker.com/Lembeh1.htm

I'm not saying dont go......just think about what you want from the trip
and can you get it there......

www.seatreker.com
Dave Morgan @ Work in the UK