I suspect OP is asking because there are no more 10 day park hopper non expiring water parks tickets available. And I think amcnj has a very good point - it's unknown if Disney will upgrade them or not. I'd suggest taking whatever you can find with all the options you want, just to be sure. Though there's no reason that I know of that you can't have a 5 day non expiring water park ticket and a 10 day park hopper non expiring ticket and just decide one day to use the water park feature (ticket #1), one day to go to only one park (ticket #1), and another day to plan on hitting two or more parks (ticket #2). If you do that, you might need to *not* attach them to your magic bands, so you can control more easily which ticket you use, would be my only caveat.