We're a family of four with an unexpected overnight stay in Seoul. We've booked the Lotte World Hotel for the kid's access to the amusement park but I can't find definitive info on the best way to reach the hotel from the airport. Is there a specific bus line that's best and where would it stop in relation to the hotel? Second we thought we would take the hop on-hop off bus line (there is one right?) to visit various sites but we were wondering which of these would be likely more interesting for our kids (6 and 8 yrs)or at least offer the most running room! Any help would be greatly appreciated!