Lake Tahoe, CA. Sharks in Lake Tahoe? Card Sharks maybe, although you may see other aquatic species in the crystalline clear waters of Lake Tahoe. Sand Harbor State Park located on the northeast shore of the lake offers both comfortable water and air temperatures this time of year, making it a perfect swim venue. The 1-mile swim will start at the beach next to the boat ramp, swim out through the unique rock formations and finish at the south end of the park