I am at 18000 miles and so far I have only done oil changes and tires.

I will be checking the brakes when I put my 3rd rear tire and 2nd front tire on soon.
I will need to change the air filter soon I think.
Is there anything else I need to do soon?

I am at work and do not have access to my manual but want to plan for my service this weekend or what is needed soon.
Steve