IMO, you are too active for most the parks in the RGV unless you're heavy into happy hour. Almost all the parks are setup for park models and year round stays which is great for the older crowd. As someone once said to me when I was thinking about going there, expect to age 10 years.
Check out South Padre Island in the lower RGV. You can only leave a rig there for no more then 6 months. This forces those snowbirds into being more mobile. Down side to SPI is the salt damage to the rig can become an issue after a few winters.
Texas is a big state as you know. Best thing to do is be mobile until you find what fits.