Try to assign yourself an interesting task ahead of time. Rehearse it throughout the day. Make it something really imaginative and colorful. Maybe get swallowed by a whale, fly to the center of the earth, or meet your favorite mythological or religious character. Even the most boring OBE-type lucids can turn fun if you let them. The trick is to just hold your goal in your mind as you explore the dream world. Let your subconscious grow this seed into an adventure. You just explore while expecting it to be fun.

If you need inspiration, try reading through other peoples dream journals, or some of the old Tasks of the Month.