I'd suggest some tire-levers and a good patch-kit. And a multi-tool to carry onboard. Such as this:
Get a helmet if you don't already have one.
I, too, bought a Trek 7.5 FX just a year ago. As a mechanic I have totally rebuilt it from the ground up. But even as it came fresh from the LBS (Local Bike Shop), it was a fast and very capable bicycle. Hybrids are great fun. And it's NOT a wanna-be road-bike. Or a wanna-be mountain-bike. It's a HYBRID*.
I started my upgrade by getting a new seat. The one that came with it was not comfortable to me. And the Avid Single Digit 3 brakes constantly went out of alignment - so I installed the Avid SD 7's. Perfect. With Kool Stop brake-shoes. Other than that I could have left it alone and be very happy with it.
All-in-all you're getting a very nice bicycle, with a really good warranty on top. But if you ever decide to try your hands at upgrading - don't hesitate to make a note of my name and asking me questions. The "Black-Aluminum" (hydro-formed they say) frame if worthy of top of the line components.