Most people assume that Death Valley is waterless.
Well, it is and it isn't. I've seen a couple of feet of water standing over Badwater in a lake stretching for miles, but that is unusual. For much of the year, the tourist spots of the place are awfully dry and hot. However, if you read the guidebooks and pick the right season, it can be very interesting.
We've done Telescope Peak the hard way, starting from Shorty's Well, but that was a long dayhike. The key feature is the Hanaupah Spring, which has the highest water flow rate of any spring in the park. The good news is that NPS does not require any backpacking or wilderness permits. I think there is a voluntary register, and that's all.