Whether this is a good idea is debatable. The critters and tribals scale down to your level but you also seem to get less exp for completing the quests at this low a level (sorry I wasn't writing it down to compare with my high level character). You will get some very nice weapons and armor early on by completing the zone but you may want to save it until later when exp is geting harder to come by.
The Route.
If anyone's curious as to getting past the Death Claws at the quarry area, as soon as you finish character creation and leave the Doc's office, get the Stealth Boy from the safe in the school house (there's always one there, the loot isn't random). Travel due east from Goodsprings keeping on a line to the south of the cross at the Yangtze Memorial. If you see any coyotes swing clear of them and they won't chase you.
Once you hit the highway/railroad tracks turn north. The Powder Gangers won't be hostile to you yet unless you attack one. When you get to Sloan turn east through the canyons. There are some bark scorpions there but you can outun them pretty easily. Once you get to chain link fence at Hidden Valley angle a bit to your left / north and you should come around the cliff to Neil's Shack at the foot of Black Mountain. A good idea to save here.
Stay off the road and keep going east from the shack till you hit a sheer wall and start going north, staying as high up as you can. Start sneaking and watch your Hidden icon (having your Stealthboy hot keyed is a good idea here) and when you get close to the Gomorrah bill board it will usually click over to Caution. Use your Stealthboy and keep hugging high up on the cliff until you're able to start going due east.
Keep going east until you get to the 188 overpass. From there look to the northwest for the Lucky 38 "space needle" tower and aim for it (if you have the draw distance turned down head north north west). Head towards there and skirt along the east side of New Vegas. Once you get to the Crimson Caravan head north to the hills then turn west and follow the quest marker.
