Any coffeeshop were they only play reggae?
Rastababy, Black Star and Dreadrock are all good reggae coffeshops. Dreadrock isn't exclusively reggae, but mostly. Black Star has mostly black patrons, not that it means anything one way or the other though.
Don't just limit yourself to reggae-only coffeshops. Some of my favorites are Rockerij, Grey Matter, Dampkring, Paradox, Tweede Kamer and Barney's Breakfast Bar.
Check out this cool and useful website:
http://www.coffeeshop.f2s.com/ACDfrmGu.html
Have a blast!