DO open your gift immediately.
DO use either both hands and your right hand to give or receive a present. Don't use your left.
DON'T spend more than fifty U.S. dollars.
DO give gifts such as cigars, whiskey, wine, a souvenir from your hometown, or flowers. There are no taboos in terms of giving flowers, although carnations are sometimes associated with funerals.
DO send a thank you note. Either a handwritten note or an email will do.