Originally Posted by
jib71
If you have to fly the segment from CTS to HND, then an onsen hotel in Izu might be convenient. If you care more about ease of access from Haneda, then Kamakura might be a good option.
If you don't have to fly the segment from CTS to HND, I'd suggest looking at flights for some of the locations that Always Aisle mentioned - e.g. Fly to Sendai or Komatsu (for Kanazawa). CTS also has flights to Hiroshima, Fukuoka etc. You could also just spend a couple of days in Sapporo or Otaru.
We took a day trip to Kamakura last week and it was very enjoyable. Easy walking city with interesting architecture, temples and musuems. Did you look at the Hilton Tokyo for those days - might be an option.