Learning where you can, and cannot fly is a basic part of learning to pilot a drone. To aid this there are several mobile applications that a pilot can use to check the airspace status of a potential flying site. Just scroll that map and select a site to see the warnings.
I have downloaded and used both for flight planning applications around the island. The island of Hawaiʻi offers some spectacular scenery that has made learning to fly the drone quite enjoyable.
Basically the official FAA B4UFly application sucks. A blunt expression, but appropriate, it truly does.