Spirit Mountain has significantly amped up its summer adventures, adding several downhill mountain bike trails last summer, ranging from beginner to advanced (1-218-628-2891; spiritmt.com). The trails complement Spirit Mountain's more family-friendly zip line and timber coaster, while also adding to the Duluth area's assortment of high-adrenaline attractions, including rock climbing (try Vertical Endeavors: 1-218-279-9980; verticalendeavors.com/duluth) and whitewater rafting and kayaking (1-218-384-4637; minnesotawhitewater.com). Anyone preferring a slower pace can catch the Superior Hiking Trail (shta.org), golf near Enger Tower or Lester Park (golfinduluth.com) and tour the growing number of brewpubs with a designated guide and driver (theduluthexperience.com).