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I just returned from Flamingo Beach Costa Rica and dove with Aquacenter
right next to the Flamingo MARINA Resort (as opposed to the Flamingo
Beach Resort)

http://www.aquacenterdiving.com

This is a very professional operation and enjoyed their company.  I
made the mistake of using another "operation" in the area and nearly
had a very bad experience due to their faulty equipment.  My air gauge
started blowing bubbles on my way up and when I got to the surface
their was zero air left in the tank.  Prior to the bubbling, the gauge
indicated more than enough air to surface properly.

Would highly recommend Aquacenter.

S.G.