Ron:
Pretty broad question, as it depends on what I'm doing there, how long I intend to stay and whether or not I need mechanical or avionic services.
1. Just passing thru and looking for cheap fuel, I use Airnav as part of my flight planning. If I'll likely need a ride for lunch, I tend toward FBOs at mid size airports that also sell Jet A. Most of these will have a car avail. I don't mind paying a little more for fuel if transportation is available.
2. For overnight or destination airports, I look for something with accommodations nearby within walking distance - just in case a car isn't available when I need it.
3. Fall thru spring, I generally call ahead and ask if a power outlet is within 100 feet of where I'm likely to tie down. This is for my sump heater. Does the airport have tiedowns, preheat, deice, heated or unheated hangar space available.
4. Also depending on weather, I'll look for availability of AWOS or ASOS, as well as a precision approach or an acceptable non-precision. There's nothing worse than being above a solid deck that you can't penetrate due to altitude and knowing that the airport below is VMC.
5. Finally, if it's a downtown airport in a great city, I really could care less about fuel and tiedown costs. My favorite used to be Meigs - museums, aquarium, Soldier Field, downtown. All within walking distance. Current favorite is Albert Whited in St. Petersburg. Check it out.
Terry, CFI
RV9A N332TP