What is the price per person to get into the park

$7 per vehicle

Is that a all day price ? I am looking for a place to have a 6 year olds birthday party

$7 per car with indiana licence plate. But right now there is no one at the gate except for big events until spring

As stated above, $7 per car.

You can show them your receipt and come in and out as much as you want. However, most public libraries have free passes for the state parks. You should check that out.