The Burn trail ends abruptly due to logging.
The first trail to the actual trail system is called IAB (Its A Bitch). IAB does live up to its name as you Bike/Hike 1 mile and gain 500ft, but once at the top there is no more big climbs, the trail are all rolling fun, technical. There are a few great views of the Snoqualmie Valley from up top at Tolt, but most of the trails are classic western Washington lowland forests - ferns, cedar, fir, roots, etc.
Can hold a few big puddles in the wet months, but pretty much rideable year-round.