If you don't purchase a park hopper ticket you do have to stay at the same park for the day. I am really not sure about the question about the tram. We are going in March and stayin in a Disney Resort but we have always stayed on I-drive in the past so I'm just not sure how it works.
As the other poster said,unless you have park hopper privileges,you have to stay in the park you start in. AS far as trams-do you mean buses?In any case,as long as you have a disney ticket,you are entito use any and all of their internal transportation;buses,monorails,boats,whatever you want to go anywhere you want. In fact,if you have little kids,it's a great-and free-way to spend soome tme,riding the boats and monorails and buses to the different resorts and looking around. Enjoy the pricesses.
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