The drive down the Bolivar Peninsula is very nice. The ferry ride is very easy and can accommodate any size RV/tow. Watch for dolphins on the ride and enjoy the free cruise.
Once you get off the ferry you're in city driving so keep your eyes open for urbane hot foots. Heading south from Galveston along the coast there are some pretty steep bridges which are no big deal other then the visual when you first see them. I still remember DW asking if we could get over them.
We enjoy Jamaica Beach RV park. There is a difference between the needs of weekenders and snowbirds in what they like. When your RV becomes your home for six months it's nice to have FHU/cable TV/swimming pool/hot tub/easy access/neighbors that are FT/PT'ers/etc...
As a sidebar, Galveston is a cruise port for some fairly inexpensive western Caribbean cruises which now will not require the expense of a flight. We spent a month on the Island and left the MH hooked up for a week while we took a little RCCL vacation. The park owners drove us, and picked us up at the cruise ship even. Ahhh... the life of a snowbird.