the state of Louisiana somewhere. The southwest and western areas are appealing, but seem to daunting. We only like to drive about 3 hours a day. State and COE are the parks we prefer,
I think April and early May would be ideal for a visit to Louisiana and East Texas. Wildflowers are in bloom, days have not become hot and humid.
In Louisiana: a new favorite is Grand Ecore near Natchitoches, a joint effort between COE and Red River Authority. Seems like they were trying to create a perfect RV park and they came close. Natchitoches is worth a visit with plantations, historic sites, and good places to eat.
Further south are two great state parks: Fontainebleau and Fairview Riverside. We've stayed at both several times.
In East Texas, Tyler State Park is a jewel, lakeside campsites, great trails, full hookups. Tyler's Azalea Trail attracts visitors from far and wide. {lookup on Google for dates}
There are also COE parks on Lake 'o the Pines and the former riverport of Jefferson, Texas.
Just some ideas that come quickly to mind. There are many more reasons to visit Louisiana and East Texas.