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I dove Dumaguete on Feb. 2009 and stayed with El Dorado. Here are some photos of the resort that I posted on my Facebook page: El Dorado Resort Photo Album
All I can say is that it is a very decent dive resort with very professional dive staff. They have a well-organized gear storage area and a well run dive schedule. The dive staff will look after your gear for you. All you do is dive. If you prefer to rinse your gear at the end of the day, you may do so. Dive trips for the following day are posted on the whiteboard in the afternoons. You just sign up with your name and bin# (where your dive gear is stored) and the dive team ensures that they are ready for your dives. They do up to four dives a day (2 AM + 2 afternoon). Dusk or night dives can be arranged.
I won't hesitate to stay with them again if I ever find myself in Dauin, Dumaguete.
FYI, if you want to spend more time around Apo Island, there is a dive resort there called Liberty Lodge/Paul's Diving.
You must do Apo Island. The waters around it is a protected marine sanctuary. Clear water, white sand, and very lush coral gardens.
Dauin diving is mainly muck diving as others have mentioned. Lots of fun too.
I don't know if the Ducomi Pier in Dauin is still open for divers. Lots of critters call the pier's pilings home. A must dive if it is still open.