Now that summer has arrived in full force, here are a few worthwhile—and downright fun—ways to spend the week outside.

Full Swing: Grab three friends and head to Colorado National Golf Club this Friday for the Tee Off for Kids with Cancer tournament. This event, which is hosted by the Shining Stars Foundation, isn’t cheap, but the tournament price gets you meals, drinks, and a chance to play on one of the best golf courses in Colorado. The proceeds go towards providing long-term, year-round care for children with cancer. $150; Fri, 8 a.m.; Colorado National Golf Club, Erie

Sweet and Sour: In 2007, Michael Holthouse of Houston was inspired to teach kinds how to start, own, and operate their own business—and what better way to do that than with a lemonade stand. The Lemonade Day project has since expanded to 31 cities and includes more than 2,700 children. Kids will have the opportunity to learn everything from setting profit goals to self-esteem building. Sat, 7 a.m.; Denver Metro Area

No Brainer: Help raise awareness and fund critical research to treat brain tumors at the annual Denver Brain Tumor Walks. This family-friendly walk, which has already raised more than $100,000, will help educate the community on the diverse needs of the brain tumor patients. Sat, 8 a.m.; Sloan’s Lake Park

Stroll Around: Set your 5k personal record or simply enjoy a one-mile family walk in City Park this weekend during the 5th annual Jodi’s Race for Awareness. This dog-friendly fundraiser raises money for ovarian cancer research. Sat, 8 a.m.; City Park

Take to the Air: At The Front Range Birding Company’s Festival and Open House, the focus is on all-things-flight. The day will begin with a up-close exhibition of eagles, owls, falcons, and hawks, and will climax with the landing of Denver’s Airlife Helicopter. You can find the full schedule of events, which includes auctions, educational booths, and a bluegrass concert, here. Sat, 9 a.m.; Deer Creek, Littleton

For The People: This weekend, the People’s Fair will turn Denver’s Civic Center Park into the third largest city in Colorado. This “rite of summer” will include two days of live music, art exhibits, juggling booths, and water games—in the heart of the Mile High City. Sat-Sun, 10 a.m.-8 p.m.; Civic Center Park

—Image courtesy of the National Brain Tumor Society