A:  The mountain biking is done in a nearby forest preserve, so you travel a few streets to get to the entrance, then follow the map of the trails to find the specific checkpoints (maybe a clue or answer to keep track of until the end).  There's only one or two large hills that you may need to walk the bike up.  A trail/cross bike will also do.

 

Metro trek is either done on streets in nearby neighborhood or on nearby park district paved trail.  Same concept - looking for checkpoints.

 

Kayak is one person suiting up in provided life jacket and paddling across small pond/lake to a clue in an overhanging tree, then return to shore.  Other teammate then repeats, but to different spot in lake (may be farther).

 

Orienteering involves off the trail hiking in grassy/wooded area using a map and compass (may be able to figure out checkpoint from other nearby physical locations, like ponds, streets, trails, etc.).

 

Mystery event may include shooting a paintball gun at a target or trying to cross a parking lot on stilts, for example.