I am at Vero right now and can tell you that sadly, if your dad has mobility issues, he will NOT be able to make it up and down to the beach. They have carved out a very narrow and very steep "ramp" if you can call it that. If you have no problems maneuvering, then fantastic! My husband on the other hand is currently is recovering from a torn tendon in his ankle, and he took one look and said....no. He was concerned that he could probably get down to the beach, but there was no way he was getting back up. My beach time has consisted of walking first thing in the morning while he is still asleep. The pool is lovely but the beach is disappointing. My morning walks through the ocean water have been fabulous, but I would really have liked to share it with the hubby since we're here for our first anniversary.
Regardless, this is my first time here and it is a gorgeous resort, and we sprung for an ocean view room, so that has been wonderful too. You will have loads of fun and love it here, but just don't pin your hopes on the whole family having a beach day.