A trail leads off from the right side of the Great Teacher Hall and heads uphill for a fairly strenuous 20 minutes, all on concrete steps though. At the top of the trail and the hill you will find the immaculately tended grave of Sangwol Wongak, and welcome supplies of cold drinking water. If you're in the mood for some serious hiking, the trail continues onward into Sobaeksan National Park all the way up to the 1389m peak of Mt. Shinseonbong.
The temple runs religious services and lectures, but you'll need to brush up on your Korean theology to get much out of them. Visitors can also participate in all sorts of activities for helping upkeep the temple, ranging from washing dishes to hoeing rice fields or preparing kimchi, but once again they are not set up to handle English speakers, so you'll need to get a Korean friend to tag along.