There are many companies that do this trip its overwhelming, however after much research went with Fun 2 Dive, and so glad we did, my daughter aged 13 and myself were so well looked after, highly recommend the smaller group of 6 people maximum, other groups were crowding and getting in the way of each other. Our captain Garrett and swim escort Ava, knew exactly where to go and give us a wonderful experience. There were only 5 manatees that we saw but later on we went out walking and kayaking and saw up to 70. The few that we saw in the water with us were very special. We were given lots of hot chocolate which was much appreciated and dispute being hardy Brits, used to coastal swims it was chilly. The boat had covers to keep the wind away.
There is a photo package for $45 which is worth having. You get to see your photos afterwards back in the shop. Do go first thing no later than 7.30, as it gets busy. The earlier the better for this trip. You won't regret it!!