This summer, you can enjoy time off with the kiddos and keep them entertained – without dropping a dime. After all, there are plenty of free, high-energy and low-cost summer adventures waiting just around the corner. Gathering Place This award-winning 70-acre Tulsa park along the Arkansas River offers free admission, parking and 100-plus activities. Explore art exhibits, splashpads, a high-octane BMX pump track, sports courts and 16 acres of wildflowers.