Speaking from experience, highly recommend pacing yourself. I would also spend a lot of time thinking through the order of approach (for countries). We went Canada to Mexico (I know, I know - dated a French Canadian who is now my husband). For some reason, the guys went with beer in Canada and UK. By the time they got to the American Adventure, they were doing more beer. As you can imagine, it was super filling and made for an uncomfortable start. They then switched to straight up liquor shots for the second half (Aquavit in Norway!!!) to reduce the liquid volume in their stomachs... bad idea. I think, if I were to do it again, I would start in Mexico and work my way clockwise. Granted, I don't have the tolerance I did in college, so it would probably still end badly haha! We had a lot of fun and made some amazing memories. Have so much fun!