If you like mountain biking and offroad single-track, here is a link with maps of Bicentennial Park and Campbell Tract trails. Bears do roam those woods, so be aware (and there is a bear aware class listed below on 5/2)
HOW TO ADJUST BRAKES
Here is a short video teaching basic brake adjustment (pad type, not disk brakes). It only shows how to align your mount and tension. Oh, and the guy has a very cool accent.
How To Adjust Gears
Here's one on how to do some more brake work AND how to adjust your gears. Again...cool accent.