I may just have to have a birthday party on the ice this year...
Hmmm, you tie your legs together for a three legged race, so i think you should tie you back legs together
Oooh a sack race, but with imaginary sacks! *picturing us all doing little two foot jumps around the rink*
Or an obstacle course. You may not be allowed proper obstacles, but you can do stuff like slalom through some cones or go round the middle circle or glide on one foot from point x to point y and then turn around and touch your toes