How do you use your lucidity?

Do you use it to have fun, or go deeper into your mind, or both?
Have any of you ever been able to answer a really difficult question by entering a lucid dream?

I always use mine for fun. I love doing physically impossible things within dreams.

Could you give me an example? I want to make a list of things to accomplish like many of the people here:) Maybe underwater basket weaving.

Both, but mostly the former, so far. The physically impossible things I've done in dreams include flying, teleportation, telekinesis, and summoning small objects.

Fun and i am planning to use it for self discovery and enchanment + art inspiration.

examples: flying, visiting places from movies, games, imagination, etc

I haven't LDed in a long time. Back when I was practicing, my LDs were pretty whimsical, just screwing around. But once I get started again, I plan on using it for exploration/adventure in a sense. I always get flashes of environments and lands (such as futuristic city scapes, or ruins) and I want to start creating them in my LD's and exploring them.

Also assume that my subconscious will throw in some DC's/Creatures and a vague "story" to go with these dreamscapes.

Have any of you ever had a shared dream?