Hackney Wick was warehouses and a canal ten years ago. Now it's warehouses, a canal, and a very considered public park sitting next to a football stadium. The walk across that seam is one of the more interesting short walks you can do in London, partly because the seam is still so visible.
Start at the Overground and go straight to Crate. Buy nothing; just stand in the yard and look around. From the bridge at White Post Lane you can see every stage of the regeneration at once: abandoned industrial, luxury-flat, warehouse-converted, brand-new-build.
Walk south along the canal and you're in the Olympic Park. It's flat, lightly over-landscaped, and at weekends full of families doing the cable-car loop. The Orbit is the most photographed piece of public art in Europe that nobody talks about. Keep going past the stadium and end at Timber Lodge for tea.
If you want to rinse the bittersweet feeling off, Stratford Westfield is five minutes further. Welcome back.