I had a fabulous rental experience earlier in March. I picked up my rental from Alamo at the Jacksonville International Airport and drove it to the Dolphin. I simply pulled up to the front of the Dolphin, got out, and when I explained to a CM that I was dropping off a rental it was easy peasy from there. She came back with some paperwork, told me to get my stuff out of the car and leave the key fob in the car. That was seriously it. I was able to meet up with my friend and go on my way.
Granted I was a solo traveler and I had rented a small sedan, so no need for car seats or a big van or SUV. But, I found prices were comparable to other companies with the same rental scenario I needed and dropping off at Dolphin was awesome. Can't vouch for picking up at Dolphin, as I only dropped off, but I would definitely rent again at the Dolphin if I needed to.
I hope you have a magical vacation!