While Los Antojos has made the "Essential 50" list in our Eating Las Vegas restaurant guide two years running and is, a) on the east side, and b) highly recommendable, if you're not uncomfortable in a very "ethnic" cafe environment (see the upcoming review in the February edition of the LVA newsletter), fish tacos are not on the menu here and the tortilla soup is not as good as other dishes, including the consomme "loco" -- shredded chicken and rice soup, with cilantro and lime juice, which is delicious.
We do have recommendations, however, beginning with some past reviews from LVA, where we singled out Mundo, the January, 2011 "Local Corner," for their tortilla soup, a recommendation seconded by ELV co-author John Curtas in his review: "Order the tortilla soup, and instead of the usual insipid chicken stock, a deeply flavored, dark broth of roasted chilies and tomatoes comes to the table, scented with epazote and topped with Oaxaca cheese."
In October, 2010, Anthony Curtis also singled out "Eva’s tortilla soup" (said to be Longorias' own recipe) at Beso in Crystals as one of the best he'd had in town. (We don't know if the subsequent political machinations over there and the actress's loss of ownership have affected the quality of the food at all.)
While Eva's soup will set you back $10 a bowl, the spicy tortilla soup in the Cantina at Tuscany is just $2.49 a bowl and is also an LVA recommendation, seconded by one of Twitter followers. Our IT deptartment recommends Vallarta's at 7870 Tropical Parkway for an excellent tortilla soup. Finally, we've heard good things about the tortilla soup at FIRST Food & Bar at Palazzo, too, but we haven't yet tried it.
As far as fish tacos go, that's one of John Curtas' (and Anthony Curtis') top picks on the menu at Bar + Bistro downtown, a new addition to Eating Las Vegas 2012, while co-author Max Jacobson rates the halibut tacos at Border Grill in Mandalay Bay (lunch menu only) and the grilled fish tacos at The Barrymore inside the Royal Resort, which come two-to-an-order and feature "enormous chunks of mahi mahi, plus a cucumber-radish slaw, and Poblano chili cream. At $10.50, it’s almost enough for two," he wrote in his September, 2011 blog review.
Anthony Curtis also rates the fish tacos at Johnny Smalls inside the Hard Rock, which are $9. Another @LVA_Tweet Follower recommended the fish tacos at SkyBox, the sports bar and restaurant located between the race and sports book and poker room at Aria, which serves them with spicy cabbage, mango salsa, black beans, and rice. At $15, they'd better be good!
Some googling also yielded recommendations for Baja Bar & Grill (4755 S Maryland Pkwy), a strip-mall joint near the university (i.e., on the east side -- your preference), which calls itself "Home of the Fish Taco" and serves them for 99 cents all day on Fridays and also offers free Wi-Fi. Phat Phrank's (4850 W. Sunset) gets good write-ups for its fish tacos, too, although again, we can't vouch for them personally.
Finally, here's a link to the Reader Poll we ran awhile back, canvassing your thoughts on the Best Mexican Restaurant in town, which also might give you a few ideas.
Let us know if you try any of these and, if so, what you think; and if anyone else has any additional recommendations, please drop us a line and we'll add them as "Updates" to this answer.
