Mecca Hills Grotto
This was a hike with a large Meetup group near the Salton Sea. There were a few spots of fairly easy scrambling.
Easy, that is, aside from the two parts where I needed to crawl due to low rocks. While long pants weren't really necessary, kneepads would have been a nice accessory.
The group came back on the AllTrails route (link) but went up a parallel trail.