We booked with Kawi Tours and were blown away by their professionalism, convenience and cost. Our guide, Sophie was incredibly knowledgeable. She was also flexible with timing and planning. They came to our hotel to pick us up (by boat) at 9am. This is about an hour earlier than other tour we looked into. The benefit is that we were an hour ahead of the masses! 
On our way to sloth island we stopped to see the dolphins in the open sea. We waited patiently and saw quite a few! We then made our way to sloth island and with the help of Miguel our captain and co-guide, we spotted a couple in the mangroves! We then went on to snorkel. It was incredible. We went to a reef in the sea and we jumped off the boat to see so many different types of coral and fish. We took our time and explored. When we were ready to go another 5 boats showed up! (Again, our timing was great!) Next stop was Zapatilla island with the white sands, warm carribean sea. We walked around the island with Sophie and then sat in a nice private area to enjoy the beach. We then headed back out to a floating restaurant for lunch (we went there earlier to put in our order and it was ready when we arrived!) Our final stop was another mangrove to see the starfish in their natural habitat (not starfish beach...). There were what seemed to be hundreds and itw as so cool. We then got dropped off right at our hotel again.
I can't say enough how wonderful Sophie was. You can't beat the price for this full day adventure!