Do they free parking? How much is it to park there for a day?

No free parking. It depends on which lot you go to. Just waiting to pick homebody you can go to the cell phone lot (free) & wait for them to call you or go to park for 1 or 2 hours is inexpensive. Otherwise if you park & fly on your trip then see which parking lot location or price is better for your needs.

2 per hour in daily parking

Free don't worry