I thought you were going to Japan this year?
On the assumption that you're talking about overnight "tours" can I suggest that thinking less about distances and more about places to go (things to eat, beers to drink or peace and quiet to be enjoyed) might result in more actual tours - on the assumption you have the time and the ever important permission?
All I mean is that a 200km overnighter sounds more onerous to me than taking a trip on my bike to that place I've always wanted to see....again!
At the risk of repeating myself, I've had some great experiences at weekends taking long & twisty routes to places close to me. Somehow "that place way over there" is psychologically more inaccessible than that nice camping place down the road.
The tour down the road and around the bend is much more of a tour than the one planned but never taken!