Rapid City has some really popular Legion teams. Post 22 and Post 320 have made it to World Series games several times. Canyon Lake Little League also made it to the Little League World Series this summer but unfortunately lost right away.
High school sports are very popular in Rapid City. Especially if it's played between the two rival schools -Stevens and Central. A Stevens-Central game is the talk around town for weeks. There is also ASA Softball, Rushmore Soccer Club, and volleyball leagues. Frolf is very popular. Rapid City is home to America's first frolf course!
Golfing is popular too and it seems like all ages play now instead of just stuffed up old lawyers.