Sorry I do not know what you have for a rig and what your requirements are as far as hookups.
Also how warm is warm?
If high in the 60's and lows in the 40's are okay I would recommend camping right on the beach at crystal beach, High Island, TX. Nice shelling.
When we go we purchase the $10.00 that allows you to camp on the beach for up to a year. Every 7-10 days we go to a nearby Campground to do laundry and dump and fill tanks. My motorhome goes on the beach very nicely.
The permit allows you to camp on most Galveston county beaches without added charge
To get you started here is a link to Crystal Beach that will give you some info.
http://crystalbeach.com/
PM me if you want more info
Traveling with my best friend my wife!