Where do you live? As a So Cal native, it's a "foreign" concept to not know a real Mexican joint when I merely see the sign...
A couple of tsp of the worst guac is fine. It's still going to be mostly avacado. The worst guac I ever had mayo and some sugar in it (thanks, Mother In Law). But, if it's still green, then the percentage of avacado is high. How much mayo and sugar did I actually eat? Not much.
The tortilla's worse for you than the the worst guacamole, anyway.

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Lost Dog's Blog & Workout Log
Superman never made any money
saving the world from Solomon Grundy
and sometimes I despair the world will never see
another man like him
-Crash Test Dummies. "Superman's Song"