You should be able to park at the Boardwalk with no problem. That hotel has it's own entertainment area, so Disney encourages people to come spend some time (and money) there.
You may not be able to park at other hotels unless you have reservations for a meal. Disney has been cracking down because people were having a hard time parking at their own hotels.
I think the best way to see the resorts you mentioned is to get there from Epcot. When Epcot starts to get crowded, leave through the International Gateway and either walk or take the boat. When you're done, either go back to Epcot, or catch a bus to another theme park.
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