Grand Prismatic Spring:
Grand Prismatic Spring is the largest hot spring in the United States, and the third largest in the world. The spring is named for the vivid colors seen as a result of microbial mats around the edges of the mineral-rich water.
Onward Ticket
Only 12$ and valid for 48h, OnwardTicket provides a valid & confirmed reservation from airlines. Best for anyone without a full itinerary planned out.