If you are looking for authentic tiki drinks this is what he place. I'm a rum and tiki enthusiast and have yet to be disappointed by a cocktail.
They use nothing but the highest quality ingredients and make most of their own mixers in house. However, be warned that the drinks are higher end which means a couple will put you on your butt and you get what you pay for.
If your curious, try them at happy hour as they have a good selection of cocktails half off.
My favorite cocktail bars in Pittsburgh? Acacia, Hidden Harbor, and The Summit.