you just have to be concious of what the dream is telling you. This morning I was lucid and following a group of people i knew having a conversation. Since I was interested I kept following even after I became lucid, but I used my mind to open doors, jumped huge distances, and ran really fast in the process. I find if I use lucidity to fly away from a situation which i feel is important, the dream slaps me on the wrist by rewinding to the important part and losing some realism. Just remember to be polite. Let the current plot finish and then wander off, so that your mind isn't suddenly pried away from something it wanted you to see.