In this age of self-service — from shipping to shopping, gas stations to salad bars — Sheraton Hotels & Resorts presents something else you can do on your own: check in and check out. At select Sheraton Hotels across North America, kiosks in the lobby allow you to do both — register and pay — all by yourself. As for your luggage, the bellhops are still happy to help out. (800) 325-3535,