Summer 55+ RV Park

We are thinking about finding one place to spend about 3 to 4 months of the summer in our RV instead of traveling all summer. We would prefer a 55+ park, but would consider other parks.  The most important thing is that the park has a sense of community with activities, as well as some amenities in the park and a town close by for shopping, restaurants, movies etc. We are also trying to get out of the Texas heat, so we are looking at heading north or somewhere cooler.  Any suggestions for RV parks that meet this criteria or sources for information on how to find these types of RV parks would be greatly appreciated. Thanks!