I am going to the Manila for two weeks, during which I'll have two free weekends, and was considering taking a weekend to go diving. Would it be worth heading out to one of these sites if I only have basically a day and a half (I could leave Friday evening and would have to be back probably Sunday night, or Monday morning if there's a really early morning flight)? Or should I save the diving for sometime when I could devote a whole week to it?