I have walked around the park and Heathland many time, it seems to be only Pigeons and Magpies that live there. I have not got a cycle not ridden one since my mid 20,s, tubby has never ridden a bike in her life, in her condition and being nearly 70 years old i doubt she could now,
She cannot walk far, she cannot even make it to Magpies Park, and pathways around it are uneven and some have gradients.
I am not being dismissive of your suggestion though @Slowlycatchymonkey