We stayed at River's edge just a month ago. It's your only choice anywhere near the water and Savannah. It was clean, but a bit more "rustic" than most modern RV parks. Be aware, to get to the park you will be driving through downtown Savannah. You need to be confident and comfortable manuevering your rig in close quarters. There will be plenty of sites that will accomodate your 33' rig.
I really enjoyed our tour of Fort Pickens while on Tybee, an old and mostly intact fort dating to the 1840s. And if you like seafood at all, you've got to go to the Crab Shack. One of the best meals we've had in a long time.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad