Best places to MTB near Raleigh

My son is going to NC State and when I visit I would like to take my bike and get some miles in. What is good in the Raleigh area? I am familiar with San Lee and love the down hill stuff. Is 286 around still or no? Beaver Dam, campus trails, Umstead? What is best for single track, good flow, somewhat aggressive near campus? ​online is somewhat confusing with the trails being destroyed by construction, or new ones being built (Haley's) etc. TIA