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Truth be told, there aren't a lot of 'attractions' on the order of Disneyland or Sea World between San Diego and Las Vegas, but there are a few localities which my young grandsons and I have enjoyed. The first would be Anza-Borrego Desert State Park. From San Diego take I-5 north to the Scripps Poway Parkway east to CA-67 north and CA-78 east. Note that the descent into the park on CA-78 can be 'interesting', so make sure your brakes are in good working order. Depending on what time of year you visit it may be too hot to hike into the slot canyons for which the park is justly famed. Check with the park staff at their headquarters in Borrego Springs, and if they recommend against being outdoors in the heat, there is still a very nice museum/display there. Leave the park on county road S22 east to the Salton Sea and CA-86 north. Here again you'll be below sea level, although not as low as in Death Valley, and the Salton Sea is a land locked salt lake. In Mecca and the north end of the Sea, take 66th Street east to Box Canyon Road and maybe drive into the Cottonwood Visitor Center of Joshua Tree National Park. Return to I-10 and head east to Desert Center and take CA-177 north to CA-62 east crossing the Colorado River into Arizona. Take AZ-95 north through the Bill Williams River National Wildlife Refuge to Lake Havasu City and London Bridge. continue north on AZ-95 to I-40, head west back into California and take US-95 north to Las Vegas. That will be a full day and you probably wont have time for everything, but it should be an enjoyable drive.

AZBuck