Parking are available in Watts Gallery (GU3 1DQ) during their opening several hours (they do close the gates), or simply in front of the gates if they are closed.
This was advised to us but we haven’t yet tried https://anniewxou593207.laowaiblog.com/27833360/an-unbiased-view-of-dog-walks-where-they-can-swim-guildford