To find Fortbyte number 23 of the decryption challenge, you will have to go to the area around Loot Lake, because the monstrous footprint is the one left by the creature when it destroyed part of the lake facilities. The gas station is located south of Pleasant Park on the way out of town. Finally, the RV camp site is located at the east exit of Pleasant Park.
The 3 clues point to the top of a mountain between Pleasant Park and Loot Lake. The Fortbyte will be waiting for you under a tree.