Get Into Trouble
What makes for a compelling story? What is fun to watch and perform? In improv it can be fun to mess around with your stage partners and get them into 'trouble' by putting their characters in challenging situations. It is even more fun to get yourself roped in too and trying to get out of trouble together.
If you come across a cave, sure it's scary and you don't know what you'll find inside, but embrace the unknown. Go in and figure it out together, go on an adventure and come out the other side changed and better because of it. Go on! It might be fun!
When faced with uncertainty or a challenge that is outside of my realm of experience I step in. I go in the cave and learn to deal with the monsters and and challenges that live within. I take the risk, face the darkness (ambiguity) and return with more experience and expertise. Get into trouble and bring your teammates with you.