I'm doing a couple rides around JTree this weekend.
MTB: Geology Tour Road - Berdoo Canyon. 30-50 miles
Roadie: Ride down to Colorado side: 60-120 miles depending on conditions etc.
I'm throwing the tent up either at Jumbo Rocks or Hidden Valley. If there's no room at the campsites I'll take a turnout and camp there.
These rides are steady pace, short break for lunch. Bring lights.