We decided to try the 5:30 pm tour. Its an additional 5 bucks for parking, but that is no biggie.
Our guides Matt and Mia were awesome. They genuinely seemed interested in ensuring you had a great time . The dolphins were quiet on the evening we went out so Matt was constantly checking to make sure everyone in the group was OK venturing out a bit further in search of dolphins, We didn't see large group (you can't book nature), but we did see several, some within 5' of our kayak.
Other things worth noting. They bring a "wet bag", so your wallet, phone and key fob and other items will stay safe in case you get wet (most likely) or capsize: no fear of that on our tour as the water was very calm.
This is a totally relaxing and enjoyable family thing to do: seeing the dolphins is an added bonus! Thanks Matt and Mia for a great two hours!