Following the course of the railway that once cut right across PEI but was finally abandoned for good in 1989, the Confederation Trail (www.tourismpei.com/pei-confederation-trail) is one of the best cycling routes in Canada. Winding through a varied landscape of fields, forests, rivers, valleys and coastline, it's a pleasure to cycle – not least because it's almost entirely flat. Some sections of the trail are completely canopied; in late June and the early weeks of July the trail is lined with bright, flowering lupines, and in fall, the changing colors of the foliage are a wonder.
The tip-to-tip distance from Tignish in the northwest to Elmira in the northeast is 273km, but branch trails bring the total possible distance to 435km. You don't necessarily have to do the trail in one go: it's easily done in sections, since the main trail passes through major towns including Summerside, Kensington and Mt Stewart, with branches to other towns including Charlottetown, Souris and Montague.
Miles are measured from west to east (Tignish is at 0km, Elmira at 273km); since prevailing winds on PEI blow from the west and southwest, cycling in this direction is easier.
You can download a trail map and route guide from the Tourism PEI website, and information centers can help with route guidance, accommodations and bike rental.