Considering we're moving nearly an order of magnitude than most of our characters ever have -- especially since none of us are very serious riders, I think -- any formation we make up is going to be a rough model to hold to.
As for whether we stay close or spread out, the closer we get, the better we handle melee, the farther we spread the better we handle area effects.
I think we're more likely to be ambushed by wendigo than wizards, so I'll vote for Rystil's proposal.