Maid: I am one who tips at the end of the stay. But the more I think about it, the more I think I should tip each day as maids may change from day to day. I feel the star level, but not the price you paid should have a bearing on what is left. I usually tip $2-$3 a day. Bell Services: When staying is 4* hotels, if I have a lot of luggage, I prefer to use the Bell Services to help with luggage to my room. I will usually tip $2 a bag. However, don't feel obligated to use them if you don't want to. Parking Attendants: Valet? I will usually tip them $5 at both pickup and dropoff. Desk Clerks: Never would tip them. If you nicely ask for what you want in terms of a room, they usually will try to get it for you. Don't do the bribe tip to try and get a better room. Room Service: At most hotels a delivery and gratuity (15-20%) is added to the bill. I do not tip above this as it is already added. Shuttle Bus Drivers: This really depends. I will usually tip $2 if I feel it is appropriate. Concierge: If the concierge does an amazing job for you, tip them. For example, getting you tickets for a hard to get show, getting you a good restaurant reservation, etc. However, for simple directions a tip is not needed, IMHO. Some say I am a very good tipper, and I would agree. I feel that if the service warrants it, a very good tip is appropriate. However, tipping is a very individual decision. When using Priceline, I feel I saved so much on the room I can afford to give a little extra when it comes to tipping.