Kris Humphries introduced his bride-to-be to his friends before hitting the lake for some watersports fun together on July 4.
'Kind of obsessed with Lake Minnetonka! Boats & O's!' Kardashian tweeted. 'It's like Vegas on the lake over here!'
And proud Kris even uploaded a photo of Kim on a jet ski to the micro-blogging site. 'Look at Kim tearing up the lake!' he wrote, nicknaming her 'Kaptain K.'
During their trip, Kim also watched her man throw out the first pitch at a Minnesota Twins baseball game.
'Kim was very nice to everyone. Fans had baseballs for the Twins players to sign but when they saw Kim by the field to watch Kris they all ran over to her to get them signed,' a source told Us Weekly. 'After Kris threw the pitch they went up to one of the suites and watched the game.'