App: Maplets.
Available on: Apple devices only.
Cost: $2.99.
Once you get to your city destination, you'll still probably need a map of the places you plan to visit, especially if you plan to spend time in a national park, zoo, theme park or city subway, says Kissiloff.
The Maplets app lets you download maps of these types of places into your mobile device before you even arrive. With this software, there's no need to collect crumple-prone paper maps and stuff them into your pocket.
Because you're downloading the data into your device, the app "is also helpful if you're traveling to an off-the-grid area where cellphone reception is weak or nonexistent," says Kissiloff.