Family vacations can add up quickly, and including some free fun in the mix is a great way to keep your budget in tact while still having a great time! We went to Rapid City in summer of 2019, and found tons of totally free fun for kids, plus some ways to keep our costs down with some of the non-free fun. here are my top FREE attractions for kids in Rapid City, South Dakota. PS: Check out my post on visiting Badlands National Park with kids for suggestions of fun stops along the way if you are coming from Sioux City, Sioux Falls, or other points east! Mount Rushmore and the Black Hills photo of Mt. Rushmore, taken by my 10 year old! Rapid City's most famous monument is actually in Keystone, South Dakota, about a half hour from downtown Rapid City! You could easily spend your entire Rapid City vacation in the Black Hills, where you find Mount Rushmore and the Black Hills! Mount Rushmore is very kid friendly, and the main plaza is stroller friendly. However to get a closer l...