My husband and I are backpacking the West Rim Trail in April. We will be starting at Lava Point and ending at the Grotto Picnic trailhead/canyon floor. I understand that we will need a to pay a shuttle service to bring us to the Lava Point trailhead, but is it necessary to pay a shuttle service to pick us up at the end of our hike? It looks like the park provides a free shuttle service that runs to the area where we will have our car parked (in Springdale near the Zion Adventure Company). Thanks!