One of the better ways to spend a day in Munich, especially with kids. The Deutsches Museum sits on…read morea small island in the Isar and covers pretty much every corner of science and technology, and what makes it stand out is how much of it you can actually touch and interact with: cranks to turn, experiments to run, buttons that do things. It's not just cases full of objects behind glass.
Depending on your party and how they like these type of things, plan for at least half a day; the place is enormous and easy to get lost in, which is half the fun. The kids' sections held up well for the younger ones, and the aviation and engineering exhibits kept the adults just as occupied.
You can bring in food and some of the areas allow food and drinks so bring your lunch and find a place in the halls to sit if you want to.
Buy your ticket online before you go. The walk-up queue when we visited was long enough to lose a meaningful chunk of your day, and there's no reason to stand in it. Depending on which ticket type you get, you may need to stop at the information desk to convert to a paper ticket before entry, which nobody tells you upfront. Some visitors seemed to go straight through; we did not. Either way, sort that out before you walk to the entry gate or you'll end up backtracking.