"You have to install a new app called "Swarm" by Foursquare. Here's a story on the new app: This Is The New Foursquare http://techcrunch.com/2014/08/06/this-is-the-new-foursquare/"
"Clay banks across from Sacramento Bar are a great place to visit. From upper parking area, just walk along American River Parkway multi-use trail and follow a dirt trail down to the banks and water."