Due to pouring rain and a sick child we didn't get to use 3 days of our 7 day tickets. We did get the non expiring. Say we go back in a couple of years, can we add more to them for just a couple of more bucks or will we have to start over at the more expensive base price. At that time could we add the park hopper option? Or where is a good web site to find out the ins and outs of tickets?