What's wrong with spending money on the local economy?
That aside, I had a particular hobby that was a lot of fun. My friends and I would go hiking in the mountains to visit the various Buddhist temples. I got to see quite a few of them, and the artwork and scenery is fantastic. It was a lot of fun, not too expensive, and I got some exercise and fresh air. Spending time out in the economy got me speaking enough of the language to get by on my own if I had to. I also got to REALLY experience the culture. The real Korea is not at all like the various "ville's" located next to every American military installation.
Also, make friends with some KATUSA's. They are great people, and they can really show you the country in a way that you would never see it otherwise. Some of the best friends I have ever had were KATUSA's.
You are on a really nice post. Enjoy it, it can be fun if you learn to make it fun.
Oh, check out the Kimche Hash House Harriers! They are drinkers with a running problem. Lots of fun! You don't have to drink if you don't want to, and the people are great.
Anyong he Kase-eh-O.