Instead of citrus zest, get your hands on some Citra hops, which end up with an aroma that's pretty much lemon-lime and grapefruit notes. Here's an extract version of the Citra APA I make that is very citrusy and refreshing. You could even still add your citrus zest for even more citrusy goodness:
FIVE gallon batch
7 lbs pale LME
0.5 lbs Honey Malt (steep at 155 for 20 minutes)
0.75 oz Citra @ 60
0.50 oz Citra @ 15
0.50 oz Citra @ 5
Safeale S-05 yeast
THREE weeks Primary
THREE weeks in bottle to carb/condition
I make about 15-20 gallons of this stuff every spring/summer!
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!