If you are visiting the Magic Kingdom you park at the Transportation and Ticket Center and ride either the monorail or the ferryboat to the park (no charge). As far as other Disney transportation as long as you have a park hopper ticket you can use the buses, boats, etc.
As for having to have a park hopper ticket, they don't ask to see them, they let anyone on. I was there Nov 02, and didn't see anyone being asked for ID, (ie tickets), so you should be fine.
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