A couple of our favorite day-trips from the Sunnyside Marina.
Directly across the lake on the east shore, is Sand Harbor. Look for the 3 large scratches (they look like claw marks) on the mountains across the lake; Sand Harbor is on the shore directly below. Drop anchor near the boat ramp on the north side of the park and enjoy the emerald waters. This is also a great place to swim, as the water temps are usually a few degrees warmer than the rest of the lake.