If you head up to Big Bay, Trail 5 has a new re-route.......was 26 miles of twistys,then became 34 miles of twistys........now unsure. the Kenikott Mine Co. is really going gangbusters up that way with the new sulfide mine. according to MSA,a whole new trail being put through there as we speak.......contact Big Bay 550 snowmobile club, they should be able to direct you on the best route.
depending on your riding style you can EASILY make Copper Harbor in 7 or 8 hours and see the Brockway Mountains and Superior in daylight,spend the night,and take a somewhat different way back.
not sure if a food/drink stop is open yet after the fire in Sidnaw,but it's a nice ride. LONG way down to the Tall Pines/Rusty Sawblade in Amasa from there,but a great loop back thru Republic on the way to Ishpeming........
Gwinn is a great loop. make sure to stop at the Tailwinds.....great place.
Munising is nice,but it can get VERY busy on trails over that way,even more so on weekends. during the week it's nice.
send me a pm if you want more detailed routes.......been riding that area a long time.
THINK SNOW!!!!