I thought that this might interest some others on here. The National Trust website has lots of walking routes, a lot of which seem to be between 1 and 3 miles long. It's part of their 'Walking Festival', which actually happens later in the year, but the routes are all available now.
We did the Zennor Head walk this afternoon, as a family, and actually ended up walking about twice the planned route. Beautiful area, nice little walk. The pdf file for the walk contained information about how to get to the start point, the route itself, and a little bit of interesting information about the area - so a nice, accessible format, even if walking is new to you.