Cheryl -
I LOVE the Boardwalk for walking - that is one of my favorite places, I've done that walk more than any other (Fort Wilderness would be second). It is really nice in the morning, before hardly anyone is up - except those buying stuff at the bakery (that line never seems to go away!).

I also like walking it in the early evening, before the crowds come back from the parks.
If I'm staying at the Pop (or other value resort), I will drive to Fort Wilderness for a morning, and often the Boardwalk (or DD) for a morning walk as well. Every area of Disney is so different...the nicest thing about the Boardwalk for me, and I lived in LBV for a year and walked there 3 or 4 times a week...there'd be kids playing football on the lawns of the resorts, families just relaxing on the beach...in my 2-3 hour late afternoon/evening walks, I'd feel like I was on a New England vacation!
The MK resort area I'll walk eventually for the site - that is different also, with sometimes a lovely mist above the water. I'll probably do an early morning and early evening for the site in May or June there.
I'm too talkative. Sorry! But the Boardwalk area is great for walking, you should REALLY enjoy your morning walks there.