DULUTH:
I lived in Duluth for a couple years and used to bike, run, ski and golf the North Shore. there are some places to ride and hike at/near Spirit Mountain.
https://spiritmt.com/
https://visitduluth.com/experience/enger-tower/
Stop in Duluth and hit the Lincoln Park neighborhood on your way in. Grab BBQ at OMC and then stop at Bent Paddle Brewing a couple of blocks away. Lots of shops, coffee and cider houses on the strip. Duluth Grill nearby may be my all-time favorite breakfast spot anywhere.
https://northshoreexplorermn.com/lincoln-park-duluth/
if you have time, stop down at canal park and walk around. There are several restaurants and shops to check out. Honestly, most are just okay but the area is very cool.
https://canalpark.com/
Fitgers is another good spot to check out. It is in an old brewery building. If you like Mexican food, they have a deck on the back pride with a great elevated view. Be sure to grab a malt at the Portland Malt Shop next door or another pint and sandwich at Sir Benedict’s across the street. It’s an English style pub and both are Duluth institutions.
https://fitgers.com/
https://www.portlandmaltshoppe.com/
NORTH SHORE:
Check out Gooseberry Falls, we have had a ton of rain and it should be roaring.
https://exploringnorthshore.com/gooseberry-falls-state-park/
If you’re into history, it is worth checking out Split Rock Lighthouse.
https://www.mnhs.org/splitrock
There are trails you can ride up and down the north shore. If you want some elevation, check out Lutsen Mountain.
https://northshorevisitor.com/things-todo/jackpot-high-climber-bike-trail-from-tofte-to-lutsen/
Be sure to go up to Grand Marais, you won’t think you are in the Midwest anymore, it looks more like Maine. A few places to check out while you are there, including a couple of great state parks/forests.
https://www.voyageurbrewing.com/
https://hungryhippie.com/the-tacos/
https://thefishermansdaughtergm.com/
It is worth check out portions of the Superior Hiking Trail, especially near the Cascade River.
https://superiorhiking.org/
https://www.dnr.state.mn.us/state_parks/park.html?id=spk00133#homepage
I assume you’ve already done some research but let me know if there are things you are looking to do.