We lucked out! We drove up to the area to see the Three Sisters Springs as our friends had been there the previous week and the manatee were still in the area. Unfortunately, one week and there were zero manatee spotted. We happened upon River Ventures, went in and got the last two seats on their last venture for the day. All the employees there were friendly, helpful and knowledgeable. They supply the wetsuits and snorkel gear (all clean and in very good condition). We took a short bus ride to the pontoon boat and found some friendly manatee pretty quickly. The boat captain was great, the tour guide was excellent. Follow their instructions they know what they are the doing. An absolutely wonderful adventure that we will be doing again a littler earlier in the season next year.