I always bring 1 or 2 soft cover sci-fi novels with me when I travel. It's a bit of a tradition. I don't read much on my trips, but transit and rain days usually add up and give me enough time to make it through 1 or 2 novels. It's also how I discovered Iain M. Banks (when I ran out of stuff to read in New Zealand and bought the most interesting looking "random" book at a small local bookstore)
I am looking for suggestions on what to get for my trip to Japan. To be blunt I am pretty much only interested in stuff that will make me think and has good characters. So for example Iain M. Banks novels have been perfect for this and I have a couple that I own that I haven't read yet. But I wouldn't mind mixing it up a bit. I was going to bring some of the Hyperion Cantos, but I only have 250 pages left (of the 800 page long 4th and last book) so I figure I might as well finish it before my flight instead of dragging a huge book along with me that I'm going to finish soon anyway.
Grand sci-fi space opera type stories seem to tend well to rain/transit day readings on trips, if the characters are good, such as in the Dune. Stuff that is written well and is epic in scale and has good dialogue is usually fairly engaging, so since you can't control the rain it is easier to get into at the drop of a hat. But I have already gone through the original 6 books twice. I have some of the prequels that I haven't read yet. Mentats of Dune is the only soft cover one I have. I might bring that, but Kevin J. Anderson and Herbert Jr. are mediocre at writing dialogue. The characters are decent but a bit wooden. So I wouldn't mind reading this book, but maybe there's better options that I don't know about.
Other classic novels/series I have already made my way through: Foundation, original Ender 4-tology, Rama, The 2001 series including the time books.. and a whole crapload of standalone books from various authors but focusing on Asimov and Clarke
According to my research I should be considering these as options: Vorkosigan Saga, Mote Series, Zone of Thought series, Revelation Space, Lilith's Brood, The Night's Dawn trilogy, The Left Hand of Darkness, Hainish Cycle, Majipoor Series, The Heechee Saga, Xeelee sequence, The Gap Cycle
These are eliminated as options for various reasons: Ringworld, Mars Trilogy by KSR
As you can see this seems to be important to me, so I welcome any suggestions
tldr: Looking for a good book to read or two, good characters, epic in scope, well written, will make me think, sci-fi, elements of fantasy or other genres is fine