In reply to Wiles:
You still haven't said what grades you are looking at, where your climbing focus is (multipitch trad?) or how tight your budget is. It makes a difference to any recommendations I might make as a lower grade SW US regular visitor. I think Robert's advice is broadly right... if this isn't going to be a regular thing, get a taste of the best... the best of the best in my view for multipitch below 5.10 is Red Rocks but its normally mostly too warm there until November. World class trad stuff below 5.10 I've enjoyed that is extensively available includes: around Moab (normally too hot until November), Lake Tahoe (esp Lovers Leap.. best in October), Yosemite (Tuolumne.. early October and The Valley... from mid October), The Needles (October), Tahquitz-Suicide (Oct and Nov), Joshua Tree (from Nov), and Bishop for bouldering (better in Nov). I've enjoyed lots of other places but of those maybe only Zion is worth considering for a quick visit on a rare trip as its so spectacular.
One thing I would say is have a flexible plan. Fires and weather can make any plan A impossible.
Mountain Project is an amazing planning tool. I've illustrated this at Red Rock with classic multipitch stuff to 5.9
https://www.mountainproject.com/route-finder?selectedIds=105731932&star...
....or maybe you want the best 5.8 multipitch climbs in all of California.
https://www.mountainproject.com/route-finder?selectedIds=105708959&type...
Post edited at 09:38