You can always count on “America’s diner” for warm, basic charm. But hanging with the cool kids on Fremont, Denny’s had to get more creative than Moons Over My Hammy (still the best sandwich name ever). From the ’50s vibe to the full bar to the wedding chapel, it may be the best Denny’s anywhere. 450 Fremont St., 471-0056. 24/7.