The best job you could ever have. Its a wonderful job where you get to work outside, meet new people everyday, and gain valuable experience for later in life. Many people think that guards just sit around and work on their tans. Yes, that is true to some extent, but there is a lot more to lifeguarding than most people think. Guards have to clean the pool/bathrooms/surrounding areas, check chemicals, balance chemicals, write incident reports, perform pump/filter maintenance, clean skimmer baskets, etc.
Managers have even more duties. They must do the scheduling for one or more facilities, make sure that the guards actually show up to work, and in general make sure that everyone is doing their job and that everything is running smoothly. And managers get paid pretty well.
17 year old Manager: I love being a lifeguard. I just got a $1700 paycheck for two weeks of work. I think I'll go shopping after I finish this week's schedule and fire someone.