great way to get to know a city! I always take a hop on hop off where ever I go on the first couple of days I am in a particular city. it really helps me give a feel for where I want to spend more time.
Unfortunately we did not enjoy our hop on - hop off bus tour of Seoul. Perhaps it was the time of year - early spring - but this was not a nice way to see the city. We ended up not going on the tour the second day and instead toured on our own.