This is a fun spot for younger-teenage kids, not so much the adults. If you have the time check out the maze *caution you may get lost for an hour or two*
The National park is one of our favorite spots! You will have to pay to get into the park but we think it is well worth it! There are also plenty of free hikes around Kalispell/Whitefish. Pro tip, if you arrive early or plan on staying a few days after the wedding you can drive to the East side of the park and stay in Saint Mary or Many Glacier hotel.
Here is a list of a few Golf courses in the area, there are many more: Iron Horse Northern Pines Buffalo Hill
There is a nice playground here for kids and a frisbee golf course (bring your own frisbee)!
Go see a movie playing!
This is our favorite pottery painting/glasswork place around! Note: they can ship your artwork when completed if you do not live local.
There are plenty of thrift stores, bookstores, coffeeshops, and restaurants. Do a quick yelp pr google search, explore as much as you can!
Wayfairs is a great option to see the lake, caution it is a big lake and will still be cold in June. There is a fee to drive into the park for non-Montana plates. There are other access points to the North/West side of the lake.