My kids tend to have the same problem. Without some guidance, they would entrench themselves in one or two activities (primarily Legos and imaginary play) and disregard all other responsibilities (such as brushing one's teeth and changing out of their pajamas).
For both the kids and myself, I have come up with a guiding schedule to help us glide through the day. We have time to complete our responsibilities and still have time for some fun. The schedule is not set in stone, allowing for some flexibility.
How do you keep your family rolling along? Do you have a strict schedule, a guiding schedule, or do you just fly by the seat of your pants? I love hearing and learning about how other families structure (or don't structure) their day...so let me know.