Boardwalk is a Disney Resort.
Boardwalk is a Disney Vaction Club Residence.
Boardwalk is a shopping, dining, and entertainment area.
Most popular entertainment is at "Jellyrolls", a bar that features "dueling piano players".
Also, there is the ulitmate Sports Bar, the ESPN Club.
A few shops and kiosks offering various gifts, clothing and food items.
There are several FINE DINING restaurants as well (ADR reservations suggested).
Boardwalk is located VERY near Epcot (5 minute stroll from Epcot's "rear entrance" the International Gateway, located between UK and France pavillions).
You can get to Boardwalk from Downtown Disney or any theme-park by bus, or (from MGM or Epcot) by the Friendship boats.
Boardwalk is right across the lake (and reachable by the Friendship boats) from the Yacht & Beach Club and the Swan and Dolphin Resorts.
For more on boardwalk, go HERE:
http://disneyworld.disney.go.com/wdw/moreMagic/moreMagicLanding?id=BoardwalkLandingPage
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DOWNTOWN DISNEY:
is a MUCH LARGER shopping and dining complex.
It is connected to Pleasure Island, the night-time entertainment complex, and the DtD "West Side", another distinct area of big-name restuarants and shopping.
The "Cirque du Soleil, La Nouba" theatre is here, as well.
There is the "world's largest" Disney merchandise store there, as well as many other shops and restaurants (McDonalds, among them)
There's even an interesting display of very large
LEGO sculptures.
See more about DtD HERE:
http://disneyworld.disney.go.com/wdw/moreMagic/moreMagicLanding?id=DTDLandingPage