Short answer: The Meadows and the canal path beside it are flat, free and continuous. The pannier market is covered, level and wide enough between stalls. Lydford Gorge is the one to avoid — it is steep and rocky with drops, and there is no step-free version of it.
A large free park between the River Tavy and the Tavistock Canal, flat throughout, with its own parking and two cafés on site. The canal path runs on from it on the level. This is the best accessible outdoor hour in the area and it costs nothing.
The pannier market is indoors under a Victorian roof, level, and open Tuesday to Saturday from 9am to 4pm. There is a café inside. Being properly covered rather than open-sided makes it a genuine wet-weather option rather than a damp one.
Friday is the Charter Market and the busiest, which means more to see and less room to move. A Tuesday or a Thursday is quieter if space matters more than choice.
Tavistock was largely rebuilt in the nineteenth century on a planned layout, which makes the centre more regular and more level than most Devon towns. Pavements are reasonable and the distances are short.
Partly wheelchair accessible, with gardens and woodland walks. The main areas are manageable; the further woodland paths are not. It is twenty minutes south and the most accessible of the big attractions nearby.
Granito Lounge is dog friendly with food until 10pm, though the music is loud. The market café is level and indoors. The Meadows cafés mean you can do a whole visit without leaving flat ground.
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