I've got a '95 Accord, with almost the same engine. I can get a real good look at how clean the valvetrain is by looking through the filler hole.
If you want to see more, go to Harbor Freight. They have a set of mirrors on rods, sort of like what a dentist uses. Costs about $20 (at my local store anyways). That would fit right into the filler hole. In conjunction with a flashlight, you should be able to see quite a bit.
BTW, if you like, I'll can send you a pic looking into my valve cover for comparison's sake. PM me if you're interested.