From the main entrance of Mahoney State Park, follow the main road. Eventually you will come to a fork in the road and stay to the right. You will see the Riverview Crete Carrier Lodge with the parking in front. There will be signs up that you can follow!
To park in Mahoney, you will need a Nebraska State Park entry pass. A day pass is $7 for vehicles registered in Nebraska and an annual pass is $35. For vehicles registered outside of Nebraska, a day pass is $14.