Up North resorts are few but nice
We have stayed at Lakehomes at Superior Shores twice, 2 different years(March/April) and have
loved it at that time of year. Sometimes there is snow/ice and other times you can go hiking, depends on the year.
Beautiful units there: 3 RCI trading resorts on same site (Twin Harbors): Superior Shores, Lakehomes at Superior Shores, & Burlington Bay
We have 3 more vacations booked there for upcoming Thanksgiving week, Christmas week, and a week in February (Valentines week). Both the sleeps 6 & sleeps 8 units are spacious units with great view of Lake Superior.
We also have a week over Memorial Day at Caribou Highland in Lutsen. Beautiful setting there and we have a 4 bedroom sleeps 10 for there!

It's possible to get into those resorts with persistent checking but an ongoing search would be beneficial if you really want to get into these locations as there are few weeks offered and they are snatched up pretty quick, sometimes as quick as 24 hours after made available.
Great thing about going off season, no mosquitos:rofl: