And if you run into car trouble, AAA has a variety of mobile apps and services at aaa.com/mobile.
• Once you’re there
Get your bearings with the JetLag Genie ($2.99 for iPhone), which uses your flight info to customize a jet lag sleep plan. (It may also suggest you take some melatonin.)
For the geekiest travelers, Wikitude (iPhone/iPad, Android, BlackBerry and Windows Phone) puts an augmented reality layer over your destination just in case the place you’re visiting isn’t stimulating enough on its own.
And if you’re traveling with a buddy and splitting costs, Trip Splitter ($1.99 for iPhone/iPad) and Expense Splitter (for Android) are a good way to keep track of it all to avoid future arguments.
The geek-friendly Hotspot Shield VPN (free for iPhone/iPad and Android; pro version available for $30 a year), can protect your privacy while using Wi-Fi, bypass firewalls and allow you to access websites that may be blocked in other countries.
• The app you already have
You may discover on your travels that the app you turn to most is one you used long before you left home.
Google Maps, no matter what device you use, is still the best mobile maps app. But you may not know about Google’s Field Trip, which highlights spots you may not be aware of on your trip. It’s on Android and iPhone.
Yelp, Urbanspoon and Foodspotting will keep you well-fed on the road with advice on restaurants.
And last, if you’re a former Foursquare user who hasn’t used the location app in a while, give it another try. It’s a good way to find tips, special deals and photos, and perhaps even make new friends in locations you may be visiting.