“A visitor might descend upon this planet a thousand times and never see a tiger. Yet if he chanced to come down into a jungle he might be devoured. There are jungles of the upper air, and worse things than tigers inhabit them.” 

- "The Horror of the Heights" by Arthur Conan Doyle

Balloon Tomb of the Ancient Aeronaut is a brochure adventure for Chris McDowall's Into the Odd and similar games. In it you will explore an ancient airborne bouncy dungeon tomb and survive the inflatable horrors within. 

The price tag is 3USD, but feel free to download a community copy for any reason. 

You can find some GM tips for running the adventure here.