I would hold onto the 'Visit_____.info" domains. When .info becomes more widely used/accepted, you will find buyers within the travel industry who will make good use of the doms and pay a decent price - likely in the XXX range.
If you're looking for a low-mid XXX price, you might try contacting the 'Chamber of Commerce' or the 'Convention and Visitors Bureau' of the specific cities you listed. Good luck.