Well, here is my opinion on diving in Costa Rica.... I have dove there many times and it's really good...I would dive in Guanacaste with Deep Blue Divers..they are really good. I've dove Bat Island....Catalina Island and many other sites and they are all good. As a matter of fact i was due to go on June 20th. for 2 weeks diving but now i'm not heading there...friends of mine are going that week and will be diving in Guanacaste. If you need a place to stay there go to Flor de Itabo hotel very nice and very cheap and the people are all really nice. If you still need more info. send me a message and i'll respond..or just post here.