The Premium and Platinum are not dining plans, they are meant to be all inclusive vacation packages. No room discount or any other discount is allowed, and yes, tickets must be purchased too. This comes up too often. I blame Disney for including the info on their website under the dining plan link. People don't realize how truly expensive it is, they think it is another dining plan with more stuff included, let's do it!
Too often people post Disney won't let me do this. No, they won't. They will if you buy the entire plan as is, they won't let you cut it up and change it for your purposes. I really wish Disney would take it out of the dining plan area altogether, it really does not belong there at all. Then they would not keep having this misunderstanding and unhappy possible customers. It is a very expensive option, and people don't realize it is not just another dining plan. Even some of the CMs on the phone don't realize it.
EDIT:
Are you really wanting the tours and recreation? They are easy to book and do. You have to plan and reserve them as well, just like ADRs. You can make reservations for parasailing, waterskiing, golf lessons, horseback riding, tours, fishing, etc. There is ALOT to do besides parks. It is easy to schedule and do. Timing is the problem. A lot of the tours are all in the morning, for instance, so you can't do 3 or 4 a day to make best use of the Platinum Plan. And parasailing, waterskiing, fishing excursions, etc are subject to weather. It is really hard to "get your money's worth" from the Platinum Plan, versus just pay as you go, and do what you want when you want or are able to do.