Sand Dunes 
To dream of a sand dune suggests that you want to escape from some truth or issue that you deem to be unpleasant and distasteful.
Crossroads
To dream that you are at a crossroad indicates that you have an important and perhaps difficult choice to make. Whichever path you take will lead you into a significant direction. Be careful and thoroughly assess each option before you come to a conclusion.
Backpacking
To dream that you are on a backpacking trip is a symbol of your self-assurance and self-preservation abilities. The dream may represent all of the hardships you have overcome.
Hitchhiking
To dream that you're hitchhiking signals feelings of unworthiness. Perhaps you owe your current success to others.
Hang Gliding
To dream of hang gliding indicates personal liberty and courage. Dreaming of hang gliding symbolizes belief in one's destiny. On the other hand, to dream that you crash a hang glider means a loss of faith and failure to commit.
Roller Coaster
To dream of riding on a roller coaster is a portrayal of the highs and lows in your life. This may be caused by your life choices and outcomes.