Enjoyable 3 hour bike ride through several several islands in Stockholm (Norrmalm, Södermalm, Gamla Stån, and Djurgårdsbrunn). Stockholm Adventures (the tour company) is well stocked with gloves, helmets, and essentials for the trip, and the bicycles were a good fit. The terrain is mostly flat but it was quite windy, so definitely dress in layers. It's a nice breadth-first overview of Stockholm's attractions, so you can explore the parts that interest you in depth by yourself after the tour (e.g. entering the museums, hiking, going on rides in Tivoli).