what kind of riding are you looking for??? do you live right in van?
check these websites out
http://www.davenorona.com/moto/areas.htm
http://www.fvdra.com/
I ride at tailing ponds and chipmunk creek normally. Tailing ponds are about 25 minutes north of hope. Tons of technical riding. tight single tracks. the trails are rated as circle, square or diamond like a ski mountain. You pay FVDRA a yearly membership fee to play there.
Chipmunk creek is on the road out to chilliwack lake. Good riding out there
I hear vedder has some pretty hairy single track trails but i havent been there yet. I hear its hard to find the trails too and very difficult to find a map of the area.
Blue mountain(mcnutt) is closer to home in maple ridge. Some good trails there but gets pretty busy as its the closest place to town pretty.
You could check out the MX track in mission too.