Of Japan's many fantastic cycling routes, the Shimanami Kaido may be the most well-known. Connecting Onomichi in Hiroshima with Imabari in Ehime, the route is around 60 kilometers in length and provides some fantastic views along the way. Having a place in mind to start or finish your journey from is helpful, and Onomichi U2 is the perfect destination for it. The multi-purpose premises includes various eateries, a hotel, and retail stores in the one spot.
If you need a place to stay, Hotel Cycle really caters to cyclists - they offer check in services while you're still on your bike and the ability to take your bicycle up to your room. The hotel even provides a range of bike tools if you need to fix any issues that might arise while you're out exploring.
If you want to grab a bite to eat or drink, Yard Cafe is a super-convenient option. They provide a "cycle-through" lane so you don't even need to head inside, and their menu includes a range of tasty sandwiches, fresh juices, coffee, and energy bars. In addition, there is the Butti Bakery for carb-lovers, a restaurant that serves breakfast, lunch, afternoon tea, and dinner, and the Kog Bar for those who want to finish the day with a wine or champagne.
The Shima Shop is a great option for those who'd like a souvenir from their trip - you'll find a variety of goodies to purchase here, including local food items, apparel, and Imabari towels which are highly regarded for their softness and durability. Also, if you come to the area without your own set of wheels, never fear – the Giant store at the complex offers bike rental services.
As for licenses for cycling, I never had one, but my bike was registered – we did that when we first moved to Japan and got bikes, but our apartment manager at the time took care of it for us. I think it's just to prove the bike is yours and not stolen.