The answer to this is simple, if you are a morning person who gets up at the crack of dawn, has run a mile, eaten breakfast, had your large coffee, newspaper, and morning constitutional all before 7am, then you will probably love the morning trip.
If you are someone who loves to sleep-in, takes an hour to figure out breakfast, get your coffee and newpaper, watch an hour or so of tv while looking over the newspaper while "letting your coffee work" before you get going for the day, then you'll love the afternoon trip!
Honestly, the water is the same temp. The air might heat up 10 degrees by afternoon, but the visibility, waves, and currents are not controlled by the time of the day so much that you'd notice a difference. Just pick the time of day that suits you the best. We love happy customers with smiles on their faces who want to be here having fun with us!