Twin lakes is Located in the Eastern Sierra Nevada Mountains near the town of Mammoth Lakes, California. Upper and lower twin lakes are a fantasic place to set up base camp and explore the sierras. This Review is specific to the lower loop which is on the east side of the lake just past the tamarack lodge and store. The store (open 7-7) offered a variety of amenities from clothes to souvenirs. Also available at the store were showers ($6 per person and from 7am to 6pm) and boat rentals($20 per hour) . The restrooms had sinks and flushing toilets that were immaculate!We had an awful bear Problem during our visit with other campers not securing their food in the provided bear boxes but other than that we had a truly enjoyable time! The Campsites are very spacious and shaded. The amount of shade in the campground did keep things on the cooler side all day. There is Plenty to do in the area from a lengthy bike path that covers the entire lake basin to the numerous hiking trails that cover the mountain sides. You’ll want to make sure you check out the visitor center as you come into town for a fascinating history lesson and tips to make the most of your trip! Mammoth mountain itself offers a variety of entertainment during the summer from concert series in the village to zip lining across the mountain. You’ll want to head to Main Lodge for any ticket purchases for mammoth mountain activities. In my pictures you’ll find the transit schedule for the free trolly that runs up around the lake basin and throughout the town of Mammoth along with a map of the campground!