crazyNep, sorry to interrupt in between but may be Lahure is busy or something coz today's is Friday so i thought about giving your answer whatever i know. Here in U.S. You don't want to forget to tip the Server, Cab Driver, Hair Dresser. I don't think you'll need any tour guide because if you are good on reading maps and communicating in english, you really don't need a guide. Since our LK seems a very descent person, so i am sure if his schedule allow him than he don't mind showing you some stuffs. You really don't have to tip the people in fast food restaurant like McDonald and KFC. Also if you go to any buffet, you don't have to tip either unless somebody do not comes to your table serving some foods or water. Also here you have to tip a vallet too, but unless you're not renting a car and going to any hotel, you probably don't come across any valet. I guess that's it, rest our LK bro will describe when he get chance.