You'll be fine with that bike. First thing I'd do is put a set of barkbusters on. If you are riding rocky areas, a skid plate is a good idea. A db dawg will keep the decibal nazis at bay. If you really want to throw some money at it, revalve/respring of suspension, and a heavier flywheel. Proper tires go a long way as well.
I personally ride race bikes on the trails(single track), as do some of my friends, and although you can throw a ton of money at it to make it trail worthy, you don't have to. I only do barkbusters,skid plate, and rubber.
A good cheaper mx er for the trails is the 2t 250sx, and yz250. Kx,cr and rm are good too.
I mainly ride scorra, tons of tracts to ride and the permit is only 100$.
Shoot me a pm if ya wanna come for a ride. Opening day is tomorrow.