Short answer: Totnes climbs steeply from the river to the castle, so the flat ground is down on the Plains by the Dart. Totnes Rare Breeds Farm is wheelchair accessible throughout. The castle and the upper High Street involve steps and steep slopes.
Totnes runs uphill from the river to the castle and the gradient is real. The High Street is a steady climb and the castle at the top involves steps and steep slopes — English Heritage says as much for pushchairs. With wheels, the town rewards staying low.
The Plains and the riverside by the Dart are level, and that is where several of the better places to eat are. The Waterside Bistro is right by the river with a patio, open ten till ten, and has clean baby changing. Bruto Lounge on the Plains orders at the table by QR code. The Steam Packet Inn on St Peter's Quay has outdoor tables by the water.
Totnes Rare Breeds Farm, reached through the steam railway station, is wheelchair accessible throughout. Pigs, goats, owls, guinea pigs and ponies, most of which you can feed for a pound a bag. It is the best accessible thing in Totnes.
One saving: the station car park is around £7.50, and there is free parking on the nearby industrial estate.
A community garden tucked behind the town with wooden climbing equipment, a sandpit and a shallow stream. Free, and quieter than anything on the High Street. Check the approach on arrival — it is behind the town rather than on the flat.
Woodlands Family Theme Park, fifteen minutes south, has large indoor play areas. Ask them directly about accessible areas before you travel.
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