Can you eat seeds? You could substitute pumpkin or sunflower seeds. ChezSuzanne is also allergic to nuts; here's her granola recipe:
http://food52.com/recipes...

For crunch, I'd go with more seeds or coconut flakes, but this recipe is very flexible to other flavors you might want to play with. Nekisia's company Early Bird also makes a granola with dried cherries and one with chopped dark chocolate (!). Any dried fruits I usually stir in when it comes out of the oven; chocolate goes in only when it's completely cooled. Love ChezSuzanne's recipe too.

there are already pumpkin and sunflower seeds in the recipe so you could just increase the amounts, or, something that I have been planning to try and have not yet, is to use some puffed rice or millet cereal.

Most of the time, recipes with nuts don't depend on the nut specifically for their success. Suggestions above are good. I think for you, you can use the adage, when in doubt leave it out. I like to make a very plain granola and add things like fruits, nuts, seeds (or chocolate -- how amazing is that!) depending on what's at hand, what else is on the plate, the whim of the moment. Good time to think out of the box.

You can use almond ! An almond is the seed of the almond tree and not a nut. You can "candy" like you would a pecan or walnut, or chop up and use on salad, parfaits or whatever.
I also agree that pumpkin seed (and other seeds) are good too.