OK, maybe that title overpromises just a bit! After all, when a group with a wide range of ages and personalities vacations together, some stress is almost inevitable.

But a little advance planning can help make everything go a lot smoother than you might expect.

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Here's what you should keep in mind before you go on a trip.

Cater to everyone's interests

This may fall into the category of "obvious," but believe it or not there are those who think: "Well, if I like deep sea fishing off the coast of Maine in November, everybody must!" Beaches, theme parks, cities and national parks all have a wide variety of activities and interests the whole family can enjoy.

But here's how to have a foolproof vacation: Once you've decided on a destination, have every member of the family write down what they want to do there, whether it's learning to paddleboard, or going on a long hike, or seeing the world's largest ball of twine.

Armed with that information, you can then create an itinerary by doing exactly what members want, merging certain activities that are similar or trying some things that are completely new to everyone. This wish list will let everyone feel their desires have been heard, and they'll be more likely to enjoy other's recommendations.

Take weather into account

As an experienced traveler, I prefer off-season travel for its lack of crowds and better pricing. I think it's a fine trade-off, even if it means the likelihood of colder, hotter, or more rainy days.

But for children and even teenagers, who aren't paying the bills, this might cause more moodiness and meltdowns. So for multigenerational trips I recommend sticking to the high season — or close to it.

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Schedule alone time

For me, travelers fall into two groups: Those who nap and those who don't. No matter what group you fall into, remember that everyone needs a break. I just can't stress it enough: Every day, you need to build in a nice respite, preferably around 3 or 4 p.m. If you don't, your trip will deteriorate fast, and you know as well as I do that the older generation can give toddlers a run for their money in the moody category. Those who do not nap still love that time on their own to read a book or magazine. Kids can spend that time drawing, coloring or writing in a journal.

Note: At the beginning of the trip there's always that period when everyone is trying to be polite and won't break away. Be the first to say "Well, I'm taking a snooze." Everyone will appreciate you taking the lead.