This is the digital age, and you’d be a fool for not taking advantage of that.
Besides the obvious Google Maps, one of our favorite travel resources is WikiTravel. It shows all the transportation options (how to get in, get out, and get around), cultural differences you might want to be mindful of, and pointers on how to stay safe during your travels (including LGBT+ friendliness).
If you like some more direction, AllTrails is an app that shows walking routes nearby and categorizes them by difficulty, time and length. A great way to find both relaxing nature trails and exciting city walks.
A more barebones approach would be looking for .gpx file online. These little fellas are GPS data formats that describe waypoints, tracks and routes all over the world. You can often find these on the websites of tourist centers or other specialized travel websites. Google the place you are visiting and include .gpx in your search, you may find some interesting results! All you need now is a .gpx viewer like ‘GPX viewer for android’.
There are so many travel apps out there, we could just keep going. So instead of giving long lists of apps, here are some links to others who did just that: check out these articles from Digital Trends, The Points Guy, Nomadic Matt, and The Queen of Recommending Stuff: Oprah.
A word of warning: Tripadvisor, once a reliable go-to resource for any traveler, has a rating system that can be abused. They started marking suspicious information in red, but watch out for any shady business (good tip for anything online really).