You didn't say at what temp you smoked it, but your results are more than likely caused by smoking temperature being too low. To properly smoke poultry, it should be smoked between 275 and 325 degrees Fahrenheit.
There are many ways to do this, but my preference is 300 F. Smoke the bird until the internal temp is at 165 degrees minimum. 175 to 180 is fine, but no more or it will get dry. Pull your temperature readings from an internal probe at either the breast or the thigh, careful not to touch bone.
Here's a pic of a turkey I smoked a couple weekends ago over cherry wood. The skin is crispy, as you were trying for.-
Here's another shot of it at about half way through smoking. You can see that at this point the skin is tending towards crispy-
Hope this helps you and good luck with your next try. Don't get discouraged....we all gain experience from repeated tries at getting what we want. May the TBS follow you wherever you go!