I applied in-person. The process took 2 weeks. I interviewed at Ravine Waterpark (Paso Robles, CA) in Apr 2011
Interview
You must complete lifeguard training and CPR training to work as a lifeguard. Once you do that you can get a job anywhere with lifeguards. They ask you really easy questions. It's an easy process overall. First you must pass the training test (both on paper and in the pool) then you are basically hired.