Facilities: There are many facilities, but several were closed on the day we visited. The Korean tour guide speaks Chinese and English, so there were no communication problems. The day before, they will add you on WeChat to inform you of the pick-up location and time for the shuttle. On the day of, we chose to go in the morning. The tour guide was holding a flag next to the AK Department Store at Hongdae Station Exit 4. We checked in with him and received a park guide. On the bus, he explained everything very carefully and recommended suitable activities and routes, which was really great.
Queue Times: We went in early August during summer vacation, and surprisingly it wasn't too crowded. The longest we waited in line was only 40 minutes.
Convenience of booking with Klook: Quick and easy to book.
Price: Cheap and good value.