If you are looking for maps, brochures and enquire other information about Naejangsan National Park, there are 3 places which you can do so:
Information centre at Naejangsan tourist village - This information centre is located in the tourist village, just next to the police station along the row of restaurants.
Park entrance information booth - When you enter the park and pay the admission fess, there is a small information booth there.
Information centre at the main park area - This information centre is located near to the cablecar station as well as the paths leading to the famous Naejangsa Temple and Baengnyeonam Hermitage.
Naejangsan National Park is one of the smallest national parks in South Korea, and the main portion of the national park centres on an amphitheater of mountains.
Starting from the north in a clockwise direction, the main mountains (or peaks) are:
Seoraebong (624 metres)
Wollyeongbong (427 metres)
Janggunbong (696.2 metres)
Yeonjabong (675 metres)
Sinseonbong (763.2 metres)
Kkachibong (717 metres)
Yeonjibong (670.6 metres)
Manghaebong (679.3 metres)
Bulchulbong (622.2 metres)
There is a trekking path on top all these peaks where you can do a loop to visit all of them, however this will take 5-6 hours at least so be prepared. As for me, I managed to climb to the top of Sinseonbong (the highest peak in the amphitheater) and then trek across to Yeongjabong followed by taking the cablecar down to the main park area.
The Naejangsan tourist village is the base which you start your visit to the Naejangsan National Park. This village is small and easy to move around, consisting of accomodations such as motels and inns, as well as restaurants, convenient stores, police station, tourist information centre etc. The park entrance is about 10-15 minutes walk away, and then you have to walk another 30 minutes to the main park area (another option is to take the internal buses).
As camping in the Naejangsan National Park is very limited, most of the visitors will have to stay either in the Naejangsan tourist village or even further away such as Jeongeup or Jeonju. Some even come all the way from Seoul for a day trip, but this is very rush and not advisable unless you really have limited time.
After going into the park entrance, there are some nice gardens just across the bridge. You should spend sometime to relax here (there are benches) especially during the autumn season.