Our family was fortunate to visit Curacao in February of 2014. We looked at many tour companies and chose this one based on Trip Advisor reviews and the recommendation of a friend who lives on the island.
We took two tours, both with Larry - what a fun, well-informed guy! We spent a day on the World of Water tour and a half day on the Tugboat tour. Both included some island history and great snorkelling. The jeeps are a little hard on the bum - my creaky bones would have preferred a more comfortable seat - but I knew what I was getting into. Larry managed to captivate my children, aged 14 and 18, and even got them to pay attention to his description of the water cycle! Lunch on the full day tour was basic but filling. There was lots of water and lime water to drink - very useful for North Americans not used to the heat!
These folks are well worth the money. Take your time, look around, ask them questions. The staff are friendly and helpful and will assist you to pick an appropriate tour based on your needs.