Out of vacation. Back to reality.

I realised that I don't have much time left as an undergrad. I haven't changed my mind about undergrad life. I need to travel more. I can't decide if I should go somewhere that I really want to go, like Yellowstone, somewhere where I have friends right now who will not be there in 2 yrs time, like the Midwest, or do something totally different like go on a totally free and easy trip where I buy a train pass and wander around the country for a few weeks.