It's no problem at all. You can even default one board to auto-sync when it recognizes the board is nearby. Naturally you can only auto-sync to one board.
To disconnect your connection on the board you are currently connected to, go to App Settings and scroll down to the Disconnect button. Then you can go back to My Boards and select the next board you want to connect to.
@keithers I'm goofy and I ride with my weight more on my heels, mainly because I feel I can turn, steer, etc. much more aggressively backside. I try to ride the heels as much as I can, but just to the point where I can still make frontside moves by shifting weight to the balls of the feet- that's the sweet spot for me. I may have shared this with you already but here are 2 dismounts I use all the time: www.youtube.com/watch?v=Nc9EGL1mWeM
Has anyone notice that the GPS really does not work very well while documenting way points on a "ride". I find that if I don't stop and press the gps icon so it re acquires, most of my ride path is lost. All the while, google or apple maps seems to have no problem tracking where I am.