Fantastic tour guides hop on hop facility we had three different drivers and we learnt something new on each trip. If you want to do it the next day they offer a discount
I'm sure the trolley would have been okay except it is much easier to simply walk around the island. Key West is only a 2 mile by 4 mile island. A bicycle, scooter or walking is much more feasible. I didn't board the trolley once. I just wasted my money by pre-purchasing tickets.
Wish I'd saved our money. Our hotel had a shuttle that would have been sufficient. Though the guide knew his history, it was repetitive for us. And We always seem to be in the wrong place at the wrong time for where we want to be. For someone else it may have been great, but for us it just did not work.