In Denver it's a mere shadow of what it was several years ago, but it still has it's players and houses. You might check out Rack'em, The Mirage, Felt, and The Wynkoop. Just my opinion but from what I've observed there is always action at Rack'em. I don't know this to be true, I almost never get down there, but if you're looking for action you might try about 65 miles to the south and visit Colorado Springs, I hear it's better there