What does it cost in terms of airport fees, is it facility dependent? sorry for the dumb questions, again, I'm just curious.
Depends on the airport. When I bought my plane, I flew into Worcester and announced "I want to keep my plane here". At the time, a tiedown was $60 per month. They also required that I maintain $1,000,000 in liability insurance and name the airport as an additionally insured. I was not permitted to remove the cowl (open the hood) unless I brought it down to the end of the foxtrot taxiway. Finally, I was not allowed to "self fuel". I had to buy my fuel from them.
So I drove over to Spencer (4 miles west) and spoke to the owner. The conversation went like this:
How much to tie down here?
$40, payable at the end of the month.
Do you require insurance?
Just don't hit nothin'
Can I self fuel?
If you want fuel, you're gonna have to.
I have an auto fuel STC, so can I bring in auto fuel from somewhere else?
If you want to run that shit through your plane, go ahead - it's your plane. I won't put it in mine.
Where do I sign?
Um... Nowhere - just go into the office at the beginning of each month, find your bill, and pay it.
Anything else I should know?
Yeah - it's too shitty to fly today. Want a beer?
Guess where I kept my plane?
As for transient parking (just visiting), most small airports don't charge any fees. Those that do usually waive the fees if you buy fuel from them. The only small airport with a big fee is Katama on Martha's Vinyard. They have a few acres about 200 feet from the beach where you can part for $25 or so (at least it was back in 2005 or so when I flew there). Looking back, that's really not bad, considering the proximity to the beach.
Another big issue is ground transportation when you get to the airport. I suspect Uber makes things easier than when I was flying, but that's a challenge too. We would always find places with a restaurant on the field like Block Island, Nantucket, Fitchburg, Keene, Columbia County (NY), Sanford (ME), and a host of others.