It's only got 104k but is rusting fairly badly around the rear wheel
wells. Still, it runs well so I keep it, but I'm guessing it needs one
of those 90,000 mile maintenances.

Do I just trust the Honda dealer to do all the stuff that is required?
The car is so good that it just always runs; still, I hate just paying
$500 or so with a car this old.

I'm pretty good with having the oil done, at least a few times a year,
but I think I've delayed other stuff long enough.

A bit of a nebulous post, isn't it? I guess I just have to make the
appointment before a belt falls off the car (the timing belt was done
about 18 months ago).