Sr. Sol is the best Mexican food in Athens. It's a little misleading that the restaurant name is Taqueria El Sol De Zacatecaz and not Sr. Sol. It's the same place. But when you mention to your friend that you went to a great Mexican place they always say, "Oh, Sr. Sol next to the gas station?" Yep, that's the place. I've been looking for authentic Baja style Mexican food since leaving San Diego in the early '90s and I had to go to Georgia to find it. I love going there for their tacos. I like the lingua (tongue) tacos as well as the barbacoa tacos. But the fish tacos, which are grilled and authentic, are to die for. Three tacos is all I need to fill me up, though their beans and rice - if you get a full plate entree - are good, too. It's a bit hard to find parking, and you may need to eat outside if it's busy, so plan appropriately. They do offer great margarita specials, too. I especially like their peach ones! And their freshly made chips and salsa are addicting. It's a great place to bring the kids as they have a large variety of choices on the menu and you can order plates for big appetites and a la carte for smaller ones. We mistakenly let my daughter order the veggie nachos, and she had it for breakfast and lunch the next day. Great prices, very casual, yummy food, nice waitstaff, good booze and crazy Mexican sodas. What else do you need?
I love ON THE BORDER. They have great food at great prices... but don't come during rush hour or you will wait for a while... they are that popular. They have a great variety and everything is reasonably priced. Service is usually good, too. My only complaint is that they do not have mild sauce. What they call MILD is HOT to me... and they offer no alternative. Their chips are good... but I usually end up having to eat them plain OR pay additional for a cheese dip because the sauce is too hot.
If you're downtown Fuzzy's is a great place to get some quick tacos or burritos. I recommend getting a margarita. They're pricey but loaded with booze and yummy. My only complaint is that the place is incredibly loud due to the music over the loudspeakers and not the crowd. $2 tacos (I had grilled shrimp and crawfish) were tasty, but they really need to heat up the corn totillas!