Interesting web site listing top 10 skating places in US:
http://www.iisa.org/top10directory.html
most have good slalom runs.
Here is the list copied from the site:
Central Park, New York City
Boulder Creek Path, Boulder, CO
Rock Creek Park, Washington,
DC Golden Gate Park, San Francisco, CA
The Lakes, Minneapolis, MN
Veloway at Circle C, Austin, TX
Fairmount Park, Philadelphia, PA T
he Strand, Pacific Palisades, CA
Lakefront Path, Chicago, IL
Ft. Lauderdale Beach, Ft. Lauderdale, FL
I think skating on Harb Carvers there could promote the product.