Waltz on over to the Strauss Festival of Elk Grove. Sit on the grassy knoll near the river's edge and enjoy the beautifully costumed waltz and polka dancers perform to symphonic sounds of the 32-piece Johann Strauss Jr. and family orchestra. The annual event draws an audience of 30,000, so call ahead and reserve your spot on the lawn.
Run, bike and walk outdoors along the American River Parkway, aka Jedediah Smith Memorial Bicycle Trail. You'll travel a spectacularly scenic 3.2 mile trail that runs from Old Sacramento to Folsom Lake offering many entry and exit points along the way.
Come by and check out Sacramento's Capitol Garage. With beer on tap and plenty of mixed drinks, it's especially popular with local musicians and has open jazz jams during the week. You can also order grub from a menu as varied as its local talent. It's a great destination for the laid-back nightlife you're looking for.