So, to sum up:
* I got to Himeji Castle at last, and was impressed as I anticipated; also Nara which was fascinating
* Very much enjoyed Hokkaido, in spite of it being a bit of a rush.  Very lush with vivid green forests and lovely volcanic landscapes.
* Seafood along the NE coast in particular was sensational.  Next time I think I'll go less with the packaged hotel dinners and go out some more.  The feed in Abashiri was very good.
* The 'whale watching' (orcas) cruise out of Rasau was very good.  Nothing much lost in not understanding what was being said.
* I was glad to have done the preparation of asking lots of questions here.  It did make things go smoother and gave me more confidence.  Only glitch was that of the 3 petrol stations I used, one had an attendant, but for the life of me I couldn't find an English option on the self serve pumps.  Someone helped me out both those times, though. 
* Toyota rental car worked well.  Hybrid car was great, even though I didn't realise I had booked one!  3 litres/100km, over 1,2oo km
* Dormy Inns are OK, but a bit too basic for my needs.  The La Vistas on the other hand .... 
* The speed limits are just bizarre.  30km/h when you can easily and safely do 60; 70-80 on expressways when 100-110 wouldn't be an issue.  As I was forewarned (fortunately), just doing what the locals were doing worked.  But odd also that the commercial vehicles were also 'speeding' by about 20-40km/h over the limit.  If a commercial vehicle here was caught speeding, the driver would probably lose their job
* Onsens are great. I experienced 3 distinct types of water.  'Plain water' (colourless and odorless) in most of them, the tannin stained one at Kangetsuen and at Furukawa (the last one), the water was a bit slippery, which would indicate it was alkaline.
* China Airlines a good find for later flying in the region.  Avoid JAL business domestically!
* Highlights - trip up Mt Asahi-dake, seafood on the NE coast; orcas and the onsen at Furukawa.
I think 
@drron and 
@mrs.dr.ron are going further north up the NE coast of Hokkaido soon.  Will look forward to hearing about that.  I haven't yet digested 
@rbjhan 's Japan Alps TR, but I can already see some things to follow there.  Sorry, 
@Seat0B , there will be no skiing in my future!!
I think another, longer Japan trip preceding or following next year's lounge crawl will be on the cards, if its held in June.