I just returned from another week of surveying visitors in Joshua Tree National Park. This project has taught me an important lesson – visit your trailheads before attempting to survey there! Unfortunately, I had never been to Joshua Tree National Park before the proposal for the grant was due and therefore I had to do my survey sampling design “blind”. I had no idea how many people visited the trailheads that I wanted to sample or how popular the trailheads were for climbers. All I had to go on when designing the study was a general ranking of the most popular places in the park.