I did 5 runs from the back of the church to the garden guard (the one that the Lady pops up next to), Threw away the best and worst times and averaged the other three. This is what I got

On foot 47.57
White horse (+20) 45.03 (2.54 better)
Leopard (+60) 40.42 (4.61 better)
Bear (+100) 36.20 (4.22 better)
T-Rex (+140) (aka Dragon) 34.38 (1.88 better)