Do you know, I thought about it knowing the spelling wasn't Lane. But shirley it's an area and so it's Laines. A collection of streets within a certain area.
But now I've written that, you may be correct. OK, I've checked Visit Brighton and it is Laine. But it still sounds wrong!
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...