Giżycko was once Lötzen, a small East Prussian town, and the name change tells you most of what happened to this region. It lies between two large lakes, Niegocin and Kisajno, on a narrow strip of land that has been fortified since the mid-nineteenth century. The star-shaped Boyen Fortress on the Niegocin side was built in the 1840s to guard the eastern border of Prussia. It never fought a great siege, which is perhaps why so much of it has survived, and you can walk along the earth ramparts and gate buildings at no great cost to your time.
The other landmark is the canal. A short waterway with a swing bridge connects the two lakes, and the bridge is turned by hand when boats pass, a bit of old machinery that still works and still holds up the traffic for a while. If you arrive at that moment, take it as a free pause. Sailors and canoeists fill the harbour all summer, and the town has a lively waterfront with ice cream stands and fish restaurants.
With almost thirty thousand people Giżycko is the busiest place on this ride, which is exactly why it is the right place to eat. Look for the local lake fish, zander or pike-perch with potatoes, or a bowl of sour rye żurek served in bread if the weather turns grey. Beer is cheap, and dumplings are everywhere. There are supermarkets, petrol stations on the main roads in and out, and a bike can be left in town without worry in the daytime.
The roads around town are flat and wooded, and the surface is variable. Fresh asphalt runs into patched seams, and bends tighten without much warning where a road follows a lake shore. Speed cameras and village limits are real, so stay within the signs. The Masurian summer is short and warm, September is calmer, and in mid-winter the lakes freeze hard enough for ice-sailing. If you have time for a short detour, Wolf's Lair, Hitler's wartime headquarters, lies in the forest near Kętrzyn, about half an hour away. It is a sombre ruin of concrete bunkers, and it sits very oddly among the birdsong and the ferns.