If you park in the small lot at the park its ljke $3 for the first hour. You have to pay for the hours youre going to be there up front. A ticket prints out that you put on your dash so they know you paid.
Often people park at either the Indiana State Museum's garage or the zoo. It's usually more expensive at the museum if it's an event like a concert. The zoo is $5 or $10, but it's a bit of a trek.
It varies because there not really a parking lot. You just have to find parking downtown.
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