Yes, you can do 10 days in the major theme parks -- MK, Epcot, DHS, AK.
You would also have 10 "entries" to the plus options -- waterparks, mini-golf and/or Oak Trail golf. These can be used on the same day as a major theme park entry or on the other 5 days. You can use multiple of these on the same day -- say Blizzard Beach and Winter Summer Land mini-golf on the same day.
You have a max of 15 days to use all of these entitlements -- the 10 major theme parks and the 10 plus options -- in any order you'd like. I'd suggest 2-3 theme parks days then a non-park day using a waterpark entry and mini-golf, then another 2-3 days in the theme parks followed by another non-park day doing a waterpark and Disney Springs, etc.