Quad and thigh stretches both raised and bending over at the waist. Arm swings, make wide circles both directions to warm up my shoulders. Hopefully there's a handle on a post somewhere to lean on, jog about 100 yards a few times and then I jump in before I suit up so my first time dealing with the temp change isn't when the boat is dragging me down the lake.
I wish Rossi or Finlayson would discuss their pre tournament set warmup but they keep it a secret, at least on their podcast.