What are some simple ways to take care of an older car?

I want to see how long I can keep a 92' honda accord running. It's got close to 290,000km. Any simple tips or anything in particular I should pay attention to in order to keep it running good? I do all the basics, like oil/filter and other general things. But are there other, possibly cost effective, ways to help with the upkeep of the car?
Thanks