Our first night in Yosemite we decided to jump on the moonlight tour tram ride around the park. It was absolutely stunning! They brought us around to many of the famous landmarks like, El Capitan (we could see the lantern lights way up on the cliff where the rock climbers perched for the night), Yosemite Falls, and to the most picturesque spot in the valley to see the Half Dome lit by the moon in the night sky. We had a chance to jump off and take pictures all the while offering a cup of hot chocolate and a cookie. The ride took about two hours and was rather cool in September so definitely dress accordingly. This was by far one of the best ideas we had during our trip.
Family pricing is available otherwise it's $25 per person but well worth it.