Building RV park near McKinney TX, what would you want most?

Separate long term and short term areas. Good separation of sites, access to water, electric, sewer that don’t require 40 ft reach. If you advertise WiFi make sure you have sufficient bandwidth to handle current expectations of service. A location that provides good to great cell service. Level sites, and if possible choose a location which provides shaded sites. And a personal desire unless you have long distances to amenities - No Golf Cart usage unless someone requires one due to disability.