Do you have to pay to get into the park?

yes, few dollars

Yes.

There is a park entrance fee.

$4 per car, $2 per bicycle or pedestrian. No this is not a donation, it is the Park admittance fee. Annual passes can be purchased at the Visitor Center. $60 plus tax for individual, $120 plus tax for family. There is a Military discount.

Suggested to donate, per vehicle, not per person

There is a donation box with envelopes for the $5 suggested fee.