I'm in for any of the above, except 9,000 foot mountain top in the winter. Anza Borrego would be great. Alabama Hills would be great. Death Valley would be fun. Mojave Preserve is interesting, but been there many times. Sadly Mitchell Caverns is closed. It's a fun cave with a guided tour in the Mojave Preserve. The Arizona desert is gorgeous if someone from there knows a good place to meet up. Lots of possibilities. All of them good. Someone just pick a date and place and we'll see who shows up.
Also, if anyone likes ghost towns, I will be taking a three to four-day trip in the late spring up into central Nevada to explore the Manhattan District. There are about 50 old mining town sites in the area that I've never explored. It would be fun to have several of us tooling around the area enjoying the sites. It's a photographer's paradise. Lots of old mining shacks, crumbling buildings and mine equipment. If anyone is interested, PM me and we can figure out some compatible dates in April.