Patapsco Valley State Park

The Avalon/Orange Grove singletrack network — Patapsco's best public-land MTB. Loops from 5 to 15+ miles; the Avalon Super Loop is the named ride locals use. Built and maintained by MORE (Mid-Atlantic Off-Road Enthusiasts). The adjacent Rockburn Branch SP, on the Howard County side, has its own connecting MTB trails.

Patapsco Valley's marquee short hike — a steady climb alongside a stream to a small but photogenic waterfall. Park at the Hilton Area lot off South Street in Catonsville (the gated developed area on the south side of the river).

Upstream gorge of the Patapsco with ruins of the old Daniels mill town. Standard riverside loop to the dam ruins; longer ridgetop connectors add a powerline-cut climb if you want a 4–5 mile day. Quieter than the Avalon area; bike-legal on designated trails only (yield to anglers along the river).