We backpacked to Rancheria camp and stayed for 2 nights.  It's about 6 miles from the trailhead, and an incredibly gorgeous hike.  It was pretty hot when we went, and a little hazy from wildfires, but still totally worth it.

The camping area itself is pretty big.  There were a few other groups camping while we were there, but we hardly knew they were there.  The river access was close by, so we could filter water.

We took a day hike to Tiltill valley, and it was so beautiful there.  Highly recommended.

There were a lot of bugs, so for the first time ever I used my bug net and was very thankful I had it on this trip.

The Hetch Hetchy Reservoir isn't the most popular part of Yosemite, but it's a great spot. There are a few backpacking options on the north side of the reservoir, so choose the route that best suits you. Be prepared to climb, but water is abundant.