I am going to be in Korea for about a month and a half so I was researching visa requirements. According to the Korean Embassy website it says US Citizens don't need a visa for entry for up to 90 days.
I am obviously within that time frame, but do I need to fill out anything saying I don't need a visa?
It feels kind of awkward just going to Korea without any sort of permission.
Maybe I'm just being weird, but can someone tell me what I need to have completed before I leave?