Something to get you outside, with good exercise.
Landscaping.
I did landscape construction for 3 summers, during high school. Paving driveways, flagstone patios, wood and rock retaining walls, new lawns. Worked with friends - drunk every night, hungover every morning. One of my 2 bosses was absolutely manic, crazy stuff, incredible temper.
You'll work with some interesting people. My associates for 2 summers included an ex-con (armed robbery), heroin addict (operated the heavy machinery), and an illiterate alcoholic 42 year old (had his first kid at age 11). Opened my sheltered eyes to the real world, a real motivator. My friends and I actually had a lot of fun working with these guys.