Snagging buy-one-get-one-free tickets is a great deal!! Even if you only get to experience a few attractions, it's worth it. Everland is huge and requires a lot of uphill walking, so if you want to take your time, you might need two days. On Monday, we entered the park at 10:30 AM and left at 5:30 PM, and only got to ride the Pirate Ship, see the pandas in two pavilions, ride the carousel, take the cable car, wait in line for 120 minutes for T express, 110 minutes for Lost Valley, and 80 minutes for Safari World. If you don't want to wait in line, you can pay for a quick pass.