Not sure if you have been to Monterey before but there is literally nothing to do there lol. You just go the aquarium and walk down cannery row.
You can also do the 17 mile drive through Pebble Beach.
I assume you are talking the scenic route up PCH?
Make sure to stop by Big Sur and drop by Post Ranch Inn and have lunch at their restaurant (Sierra Mar)
http://www.postranchinn.com/
Really amazing views there.