I visited Summer Salt originally to do a little snorkeling. My friends and I snorkeled with Catarina and had a great time--Catarina was a great guide and found a lot of cool stuff for us to see!
We also learned that it was very easy to do some very basic Scuba diving through the "Discover Scuba Diving" course. Fang was our instructor and guide and was fantastic--she was always professional, cheerful, patient, and had a great eye for finding super-cool stuff in the ocean. I ended up doing six dives over three days. It was really fun to get to know the staff, and I always felt the captains & divemasters handled the boat and equipment with professionalism and also were great guides to the underwater world around Playas del Coco.
Patrick at Summer Salt has a real knack for gathering a great crew of divemasters and instructors--he and his wife have been running the place for 9 years and clearly know what they're doing. If you have never tried Scuba, this is a GREAT chance to see if you'll like it: you are in very safe hands and will get the best possible experience!