Summit:
W7O/CM-036
We spent the night at Elk Lake Campground. Highly recommend it if you can get a reservation. We were in spot 11 which had great views at sunset.
From Bend take Cascade Lakes Highway to the Lucky Lake Trailhead. Fill out the free day use permit here (and put your Northwest Forest pass in your car window), then head up the trail. It's an easy 1.3 miles to Lucky Lake. There was some blowdowns a cross the trail as it's early season and they haven't been chopped yet.