Length for full walk: 15¾ km (9.8 miles). Toughness: 3/10
10:12 Stevenage train from Moorgate (Highbury & Islington 10:20, Finsbury Park 10:27, etc), arriving Alexandra Palace (TfL Zone 3) at 10:34. Use Oyster PAYG or contactless.
At the end of the full walk there are frequent Greater Anglia trains from Tottenham Hale (also Zone 3) to both Liverpool Street and Stratford, plus the Victoria line.
As it's the last day of the Open House Festival I've decided to post a London-area walk which splits easily into a morning and afternoon leg, potentially allowing anyone who wants to visit some of the venues to combine this with half a walk. The morning starters from Alexandra Palace should reach the Finsbury Park Café for a lunch stop at around 12:15-12:25 and I suggest that anyone wanting to do just the afternoon leg should make their own way there and be prepared to set off from the café at 1pm.
There are plenty of venues opening their doors this Sunday and one which caught my eye was the Markfield Beam Engine in Markfield Park, just off the River Lea towpath south of Tottenham Lock. If you take the alternative route mentioned in para 40 you should get to see this massive Victorian beam engine ‘in steam’ between 2.30 & 3.15pm. This ending bypasses Walthamstow Wetlands but you could easily go there afterwards if you wished.
If you do the full walk you'll see that it's essentially the well-known Parkland Walk (a disused railway line) spliced onto a promoted walk linking two large nature reserves, Woodberry Wetlands and Walthamstow Wetlands (but note that both close at around 4.30-5pm). There's a pub with a large riverside garden opposite the Walthamstow reserve exit if you want a tipple at the end of the day.
Please bring the directions from the L=swc.321 page.