This could easily have been a worry free tour activity. However, the voucher that Viator sent was not honored by the Lotte Amusement Park ticketing office. I have advised Viator Customer Service about this issue several times and in the many occassion, they simply sent me the same voucher every time and to a point of refusing to reply to my email any further. The Park Ticketing Office had to make a call to the agent Funtastic Korea serving the actual ticket voucher for us to enter the amusement park. It took a while and caused a bit of a panic from our group before we were let in. The amusement park was small, dated and was less impressive that expected. There were rides and other areas that needed extra fees to enter ie. small animal zoo.