Popular dog walking park, and near the A12 if you want to give Fido a quick break before heading into London. There's a lot of sporty stuff going on here, but still space for a good dog walk.
P&D Parking, around £1.50 for up to 2 hours. Leisure Centre with facilities open: Monday to Thursday: 0700-2300; Fridays & Saturdays: 0700-2400; Sundays: 0700-0900.
Full Walk Details
Round the lake seems to be a popular option.