Just some notes I need..
Ploy Diving

The Dive

Good map of Koh Chang

Koh Chang resource

seems like a nice place: Sabay resort

New Siam Guest House used to be a nice place in the Khao San Road area, so I will probably stay at:
New Siam Guest House II
50 Trok Rong Mhai, Phra A-Thit Road,
Chanasongkram, Phanakorn
Bangkok 10200
Tel. +(66) 0-2282-2795, +(66) 0-2629-0101