The KTX from Seoul takes just 35-40 (depending on which train) minutes to zip to Cheonan-Asan Station (W12800), but you'll need to connect to the painfully slow #20 or #13 bus (W1200 without a card) to get to central the Shingsegae/Bus Terminal area of Cheonan. Alternatively, you can walk about 200m to Asan Station, where for W1000 you can get a 5 minute subway (not underground) train ride into Cheonan Station. From here you can connect to both north lines going towards Suwon/Seoul or to the south lines heading to either Busan or Gwangju/Mokpo.
Alternatively, you can take a 급행 (express) subway directly to Seoul or Yongsan stations in about an hour and a half. These trains run roughly once per hour. You can find the up-to-date timetables in the ticketing area of Cheonan station where you enter for the subway only lines.
The express and intercity bus terminals are located near each other in the northern part of town. Note that the intercity terminal is hidden in the basement of the Galleria shopping mall.
A complex and confusing system of buses covers the area, but there is no information whatsoever in English at the stops or in the buses themselves. However, nearly all services start from or terminate at the intercity bus terminal.
The subway line has been extended from Cheonan Station to KTX Cheonan-Asan station and continuing to Asan.
Gagwonsa Buddhist temple at Taejosan (Mt. Taejo) 태조산 A nice place to go hiking. The Buddhist temple has one of the largest sitting Buddhas in Asia/Korea or something like that...
Upstairs from the bus station is a movie theater which plays korean and western films.
As of late 2010, the old Galleria shopping complex which doubled as the Cheonan Bus Terminal was remodeled and renamed to Shinsegae. The new Shingsegae is where most Cheonanites go for their local shopping of luxury items in Cheonan.
Around the same time in late 2010/early 2011, a new Emart location opened up in the basement of the Shinsegae shopping complex.
Across the street from Shinsegae Department Store is a whole host of other venues to buy you much needed items. Once you exit the Bus Terminal, you'll see the crowds flowing across the street at every green pedestrian light. Over there you'll also find many more food options awaiting your tongue and stomach.
Mount Fishtail is near Cheonan Station (천안역). It's Probably the only South-Asian curry restaurant in Cheonan, and a pretty good one at that. They have decently priced curries from around 8000-10000 won per dish. Nan bread and rice is extra. It's owned by a lovely Nepalese couple. Walk out the East exit of Cheonan Station and cross the street and it's on the building on the right on the second floor.
Applebee (not to be confused with the American chain restaurant 'Applebee's'. This restaurant is located near Ssangyong station (쌍용역). The way it works is you order a main meat and you can choose from a all-you-can-eat buffet of pastas, salads, other meats, desserts, drinks for prices hovering over 20,000 won a meal. It's a good place to go if you really want to get stuffed or take a huge crowd of people.
Fry Pan has probably got to be the tastiest fried chicken restaurant chain in Korea. Their Cheonan location is across the street from the Shinsegae Department Store and boarding the small park. If you can find Angel n Us coffee shop, it's in front of you and on the left. Just look around.
Cafe Riposo has probably the best Italian in all of Cheonan. Seriously. They have authentic Italian pizzas, pastas, risotto and calzones. Beer and wine is also on the menu. Better taste and prices than anything one can experience in Seoul, however the service is terrible and they are unable to accommodate larger parties.
Banana Bar in Shinbudong, across the road from Shinsegae Department Store is a great place to fellow expats and Koreans. Pool competitions, open mic night, quiz night and a full stage for performers and bands are available. You can call 010-3424-6309 and speak to Mr Oh.
Dolce Bar is another really good bar near Cheonan Station. Walk out the east exit and walk towards Mount Fishtail Indian Restaurant. A few stores past Mount Fishtail is Dolce bar on the basement level. They usually have some kind of theme on Fridays or Saturday nights, decent selection of bottled beers and usually flat draft Korean beer. Complementary chips and salsa and peanuts are common. The owner is Korean and speaks very good English. He's a good guy to talk if you happen to stroll in by yourself.
There are plenty of motels in the alleys across the street from the bus terminals and near the train station.