The Forum Shops at Caesars Palace is ginormous! Be sure to have your walking shoes on, and be ready to loose all sense of time in this other world of Las Vegas. When you walk this labyrinth of shops the sky is painted about and your circadian rhythms will tune to a different drummer as the lighting slowly changes your internal clock.
There are shops of every kind and be sure to explore all the cul de sacs as they have hidden treasures in each one!
Enjoy, and be sure to save enough energy for the trek out as finding your way back from whence you came can be very daunting!