Laine!I've no idea what you like but here is a walking guide I give to the tourists who visit my shop. This all depends on where you're staying and who you are with.
Brighton Lanes. The old original cobble stoned streets. Worth a look, they can be found between Prince Albert St & North St.
From there head north down Bond St, Gardener St and the pedestrianised Kensington Gardens (this area is the North Laines).