is parking free for a few days

Parking was free ...no signs saying towing and not a busy area where you might expect a problem...

I stayed overnight paid cash left the car there for free for 10 days

I left my there for 2 days and didn't have to pay extra

I used points to pay for room. So they charged $50 to park for 4 days But took me to and brought us back from airport. It was worth the extra charge for convenience. I would have paid that much for parking @ airport.

Actually no, they indicate free parking but they charge a higher rate for the room so if you call them to say that you want to leave your car there for a couple of days they quote a higher rate for the room.