At least all the racket isn't coming from your knees . A few simple maintenance measures will bring back the peacefulness and tranquillity to your next ride. If this doesn't work, you might need to remove the crank with a crank arm extractor, and clean off the spindle and the hole in the crank first. Also, be sure to get those bearings repacked occasionally. Usually an allen wrench will do the trick.
Spokes work loose all the time.
Also, spokes can make little clicking noises where they cross over each other. Try putting a little lube at their intersection to kill that noise. Any debris stuck in the tires can make noise every time the wheel rotates, so inspect the tires for glass, rocks, nails, and more. If it's a suspension fork, be sure to keep up regular maintenance. Tighten with an allen wrench as necessary.