I am a recreational 4-Wheel Drive enthusiast, meaning "off-roading" is a hobby of mine. Of course, my Jeep happens to be an off-road ONLY vehicle; I've probably put less than 5 miles on the street with it this year. I mention that simply to point out that my daily-driver is a 2 Wheel Drive truck. So even tho I'm a 4x4 enthusiast, I don't have a 4x4 for the street--it just doesn't make any sense in my part of the country.
You might have a reason for a 4 Wheel Drive on the street if you lived up north in the snow...but I don't imagine you have much snow in San Deigo.
2¢
PS - if you DID decide to take a 4x4 Expedition out for an off-road adventure, you'd likely discover that it's not a particularly capable vehicle, especialy in sand like out at Glamis. It's useful for ultra-light-duty off-road use, like getting you out to a hunting location, but that's about it. It's just not designed for recreational use.