The area near the Pacific Grove Golf Course has some cool ocean views, and I seem to recall it being decent for biking - roads in good shape, etc. Might not be so long though.
Also, I just got an e-mail about the Gran Fondo Bella Di Cipresso on October 8th - the route maps from this should be good riding: http://www.cipressogranfondo.com/ind...nformation.htm
Monterey is great, and the aquarium is world-class. Have fun!