If you've decided to run a LARP, whether it's a one-shot or a campaign, whether it's improv theater or boffer, you will need to find a location to play in.
Before searching a place out, of course, you need to determine what you need. How many players are you going to have? Do you need room to swing weapons? Is your game something that would concern the "normals?"
Once you have that figured out, you can move on to looking at specific locations. Each type of location has advantages and disadvantages. Some offer lots of space. Others offer greater privacy. Still others offer low price.
Parks can be an excellent place to game during the warmer seasons. They offer plenty of space. There are no ceilings to interfere with boffer weapons. They can provide he right setting for certain types of LARPs. On the other hand, it can sometimes be difficult or expensive to guarantee that your group has enough space to play in, and the setting can be absolutely wrong for urban games. There are parks gathered all over the Twin Cities. The Frozen North was known to gather at Como Park on Sundays.
Hotels provide year-round comfort, plenty of space, and may provide privacy (depending on the amount of space rented), but can be expensive.
College campuses are similar to hotels, but usually with lower prices to groups that include one or more students. Coffman Memorial Union at the University of Minnesota has been home to numerous LARPs over the past fifteen or so years.
Rental halls, Masonic lodges, VFWs, and other such places usually offer complete privacy, allowing the strangest of costumes, makeup, and acting, but usually carry a hefty price tag, as well. Obsidian Towers runs out of a Masonic Lodge in St Paul.
Private residences are also a possibility. Like rental halls, they are extremely private (at least on the inside). The price is almost always perfect. They usually have less space, however, and require a lot of work on the part of the owner to get the space ready and clean up afterward.
Within each of these groups, there are further variances that require a bit of legwork and examination to sort out. With effort, you will be able to find an appropriate location for your game, and will be able to move on to the more fun aspects of LARPing.