There's a good reason the drinking age in California is 21--kids would be bored by most bars. Their protest would probably have something to do with bars being dank, cramped, Naugahyde-filled places.
I think kids have a good point. I like cavernous bars that promise mild excitement and pollution-free lungs upon departure.
I've found such a place at Tia Juana's in Old Irvine, which is housed inside a restored 95-year-old lima bean warehouse. The zeppelin-like wood and corrugated metal ceiling guarantees that the A-bomb could go off inside and not smoke up the atmosphere.
The bar itself is 75 feet long, providing plenty of room to belly up to or--for the less sociable among us--there are private tables, some with views of the trains that zing by outside.
Order a cerveza (they claim to serve any Mexican beer an aficionado can name) or one of their hand-shaken (never blended) margaritas on the rocks, and pretend you're inside some upscale south-of-the-border restaurant that actually has napkins.