Manners of reaching to someone's place with a present of anything like flowers, chocolates, etc. In U.S., it's not feel good to give flowers to women by men. If a man giving some gifts to a woman, he should have to tell her that who has given this gift to her. Avoid giving colorless flowers as they are common in marriages. It's not a good manner to open a present when receive. Avoid drinking alcohol or taking any type of drugs before going to someone's place.