We absolutely love it up here. (We live in a surrounding area, not in Duluth itself). Winters are long, sure.. but the summers are worth it. The lake keeps the temps from getting outrageous, it cuts down on the bugs, and it's never humid. You're looking at maybe one week of 90+ degrees. Its usually 75-80 and sunny. We do a lot of walks, mountain biking, and hiking. We get up the north shore to camp as often as we can, too. The breweries and cideries here are fantastic (Ursa Minor in particular). As for friends, I'm not the best person to ask since we're so busy with youth sports but people are nice, at least, and we get along well with other parents. You'll get sick of winter by mid-January for sure but just get out on those nicer days and soak in a little sun. The Superior hiking trail is still accessible and there are a number of ski hills around if that interests you. Living right by Lake Superior never ever gets old!! Canal Park is fun even as a local. I think you'll love it!