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Take 15 south to Temecula.
Hit 79 east. Make a left at S2, and then another left at Montezuma Valley Road
Follow MVR to Borrego Springs. You can stop here for Lunch, there are several cafe's. Once you hit Borrego Springs, get on S22 and follow out to The Salton Sea. Or you can get on S3 which takes you to 78.
If you really want to get crazy, S22 will run into 86 once you hit the Salton Sea. Take 86 south till you get to 78. Take 78 through Brawley and on out to the Imperial Sand Dunes. This is arguably one of Southern California's coolest geological features.
This is essentially an all day trip, so get an early start.
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