Stop and go. Don't move too fast lest the bunnies freeze up and let you walk right past them. Slow and erratic makes them nervous and they'll break more often. When they break, watch where they stop - and they will.
Turn around often and watch your six, you'll be surprised how many rabbits will break behind you after you pass.
Watch sloped southern exposures especially along two-tracks or defined vegetation patches. Rock piles are popular warrens. On steeper slopes pay close attention to areas just below the ridge line.
Binoculars are just as effective for bunny huntin' as they are for big game. With practice you'll become an accomplished spotter of all things long of ear. When you spot one, approach indirectly.
Last two hours of daylight is the magic time.
Rabbit hunting is terribly addicting. You've been warned