Replying to I wanna Dirtbike in CO this summer

Yes I understand that it is wintertime but recently all I can think about it hitting the trails this spring and summer and just exploring CO. I grew up riding my dad's old Honda 70 and then my brother got a Honda250 but I'm still a newb when it comes to knowing your shit. I was hoping some of you could give me some pointers.

-I'll be in Boulder/Nederland and looking to explore some trails nearby/all around CO.
-Obviously the bike must be street-legal, with ability to carry gear.
-It''ll mainly be a trail bike, i'm not too concerned about speed or jumping stuff. (although a little juice is nice)
-I need something that is reliable and easy to learn on. (as far as the motor goes and working parts)

Anybody have any bike recommendations? What should I be looking for? Anything I should avoid? Pumped to do some exploring and learning. cheers guys!