Look for a seat that's not in the last row...

The 80 is a sturdy beast; don't be put off by its age... especially if anyone in the crew is older than the plane. You'll be as safe as possible in that case.

As for sightseeing, it all depends on what side you're on (and whether or not you have a window seat).

I like to simply observe the infinite variety of the sky, and try to spot airports and, of course, traffic. Great way to pass the time. :)