We will be staying in Santa Cruz, but will tour Carmel and Monterey one day. I will have my two sons, ages 20 and 17. Not sure what to do in Carmel fo 3-4 hours other than walk around and see how pretty it is and then have a bite to eat. Is there anything in particular that is a "must see". We will be going to the Monterey Aquarium, so was wanting to know if there is something similar to do in Carmel that would be interesting to them. Thanks for the suggestions.