While travel guidebooks can be useful, they're generally full of crap you don't care about, and make you look like an even bigger tourist than your fanny pack full of hand sanitizer and smaller back-up fanny packs. Ditch the book for a personalized trip guide, with Duffel
Outta the nerdy hills of San Francisco, Duffel lets you assemble custom, easy-to-manage trip itineraries from just about anything on the web, making it simple to map out exactly what you want to see, like fewer boring foreign museums and more awesome foreign midget museums. To curate a trip, you can create virtual notecards with deets for any of Duffel's categories (food & drink, activity, transport, etc), or make things even easier by adding their "bookmarklet" tool to your browser, which'll auto-create a notecard with contact, time, and location info directly from the website of any restaurant/hotel/point of interest; once you've got a bunch of cards, just drag and drop them wherever you want in the calendar sidebar, which'll print out complete with maps and full deets on each item, for an organized outline of the things you'll miss while totally lost and confused. If you're bad at ideas, Duffel offers notecards with suggested lodging and activities for most destinations (via partners like Hotels.com and Viator Tours), and'll set you up with a virtual post-it for items to pack, pre-loaded with reminders to bring stuff like your passport and phone/camera charger, etc, helping you avoid asking strangers to borrow their gadgets, and passport
If you're traveling with friends, you can share your itinerary to make the trip planning collaborative -- a risky proposition putting you at risk of having a Duffel filled with crap.