This is the list of Maintnence items to be spedified by the 2000 Honda Accord owners manual: (for *severe driving conditions)

1.Clean and or replace air filter element
2.Inspect and adjust drive belts if needed.
3.replace tranny fluid (severe condtions*)
4.Inspect front and rear brakes
5.Check parking brake adjustment
6.replace airconditioning filter
7.lubricate hinges locks and latches
8.finally check all fluid levels and hoses for leaks

Your dealer may very a tad.
For $550.00 dollars your dealer may be replacing things such as spark plugs or adjusting valves, at least I hope so.
But all of the above can be done by the basic shade tree mechanic. In fact you should inspect alot of this stuff regularly on your own. $550.00 for 2 filters, wow seems like alot of cash. The AC filter was a pain to change but certainly not beyond attempt for the first timer. Was it worth what my dealer wanted?

I'd likely just save my cash and pay the dealer for the 100k service. The tranny fluid change would likely be worth a change but generally I get coupons from my dealer for around 49.95 -- 79.95 for this service. If you are a moderate driver, you can wait on this until 100k mi as well.

Again I love my dealer, but some of these specified Honda maintnence intervals have crazy fees for simply inspecting. My dealer had my car for 20minutes during the 30k service. Nothing needed fixed and I was out $300.00

(I only did the 30k service because my warranty was going to expire soon and I had some previous warranty repairs. I wanted to be sure I had a documented visit prior to expiration for what ever good that was.)