It’s a beautiful place to be when the wildflowers bloom, that’s for sure! There are lots of dirt roads back into the canyons, so hopefully you have a high clearance vehicle. 4 wheel drive isn’t always necessary, but there are times when it would be helpful. I have a link to the state website, here: https://www.california.com/guide-anza-borrego-desert-state-park/
Definitely go to the Visitors Center and ask the rangers where the best blooms are. They are all very helpful and have all the info you will need to find the best spots and canyons.
With any luck the desert lily’s will be blooming.