Best timing for Boise whitewater park ?

I think T-TH and every other sunday the north feature (Waveshaper III) is tuned to be best for kayaking, other times it's set up for surfing. You'll probably want to play on the south feature (Waveshaper II) which will most likely be good for SUP whenever you go through. Busy times are during lunch and after work. If you happen to hit it when the wave tech is out there he can change it while you're on the wave, optimizing it for your surfing style