I need TAPER advice for 1st marathon

I have a very important question on tapering correctly for my first marathon. Two weekends back included my longest distance run, a steady, flat 22 miler. Last weekend was an 18-mile trail run with lots of elevation gain. This Saturday is a flat century ride (I'm actually much more of a cyclist so it should be no strain)...and then the following weekend 10/12 is the Marathon.

Any suggestions on how to deal with during-the-week workouts would be more than appreciated. When I was in my build phase I would normal do one 10-14 mile run mid-week + 5-6 miles 2-3x/week. I have no idea how to taper so any comments are welcome. I would hate to incur an injury or mess up all this work right at the end (or the beginning of the adventure, as it were), thanks everyone in advance.