It is predominantly «alight to…» (to walk to a point of interest, to do something remarkable and similar), with no object. RE: «set off» vs «set down». It is «

It is predominantly «alight to…» (to walk to a point of interest, to do something remarkable and similar), with no object. RE: «set off» vs «set down». It is «set down», of course. My brain was passing the gas at the time of typing it up.