Yes this is me exactly. I am any where between 3-8 years old. Sometimes I like to be fully diapered, sometime in training pants, but I also really enjoy childish underwear, briefs with colorful waistbands and cartoon pictures on them. I'm always a bed wetter though so I need diapers/drynites at night and, like you, usually need more absorbent underwear for long car trips. All the activities you mentioned I also love.