Google Maps virtually owns the navigation apps scene and it remains of the best Android apps ever. It gets frequent, almost weekly updates that seem to only add to its incredibly generous list of existing features. Aside from the very basics, Google Maps gives you access to places of interest, traffic data, directions to things like rest stops or gas stations, and they even let you have offline maps now (albiet temporarily). If you add to that the Waze experience, which includes tons of its own features, and you won’t need another navigation app. Ever. Google also owns and operates Waze. It’s unique and fun in ways that Google Maps isn’t and we also highly recommend it.
Google Opinion Rewards is appropriately named. Google sends you surveys that ask you about places you've visited recently and you get Google Play Store credit for your participation. Polls don't come in very often, but you can increase your chances of receiving more, by enabling your location and answering surveys quickly and honestly when they do arrive. It's not going to earn you a ton of store credit, but it's enough to purchase an app or an album every so often. To add some perspective, one of our editors has earned about $64 since installing the app in late 2013. Droid App