check online to see if there are enough interesting stores to make the trip worthwhile for you. those tours can be expensive and you might be happier going on your own to LA altogether. LV itself is not more than 4 days+/- unless you're a real gambler. the neon, hotels and shows are fun, but little else except gambling.
any LV people here with suggestions? that was my experience. after 3 days i was done. one day for running from shop to shop, one day for running from hotel to hotel to see them all, and one day to walk up and the two main streets. two nightime shows. then collapse! 4 days would have been better.