I've found a few people with a similar setup using an Arduino, and it seems like at a minimum I'd need something like a zener diode and 1M resistor, like in the basic circuit from this PDF (page 12). The analog pin on the Huzzah has a 1V max voltage, so my sense is that I've got to make some adjustments to divide down the voltage further, maybe include a capacitor? I'm very much an EE noob, so any advice on including & calculating the proper values for components is appreciated.
The end goal is to take input from the piezo and use it to set hue + brightness of an RGB LED, similar to the Adafruit LED ampli-tie project, but obviously with just a single LED. I can provide more details on that if it's relevant to getting up and running with the piezo input.