The Park Hopper Plus are bought for a certain number of 'park' days. For instance we get the 7 Day pass which gives us 7 days to hit any or all of the 4 theme parks. We can go to MK and stay there all day or bounce to all parks that day and we've used one day. Days not used on a given trip never expire, they can be used next year or next century. The 'Plusses' are a little different. The 7 Day Hopper Plus comes with 4 plusses. Go to a waterpark and you've used a plus. Bounce to another waterpark the same day and you've used another. Go to PI that night or any other night and you've used a third plus. The unused plussed also never expire. If our daughter decides to join us for a for days this Nov. we have a 7 Day Hopper Plus from last year with no 'park' days left but with 3 plusses, so she'll buy a regular 4 Day Hopper with no plusses and use the old pass for PI. To answer your last question, if you go to a waterpark in the morning and a theme park at night and you had a 7 Day Hopper Plus, you've used one of your park days leaving you with 6 and one of your plusses leaving you with 3. You can spend a vacation at WDW and do nothing but go to waterparks 4 times and still have 7 park days left for another trip or as my son did last year hit the parks 7 days and PI once leaving us with 3 plusses to give to my daughter this year.
Bill From PA