I am a very unorganized person (laundry all over the floor, my desk at work is disgusting, lose my keys all the time, etc) and to combat that I make an effort to update my planner on a daily basis. The type of items I scribble in my planner usually include my to-do lists, work deadlines, events I need to attend, workout schedule, items I need to buy, & more! In order to keep this habit & not lose interest in detailing my schedule, I deck out my planner w/stickers, doodles, & washi tape. This has turned updating my agenda in to a hobby rather than a chore.
Some of my (less personal) spreads are shown below.
Erin Condren & Bando have some of my favorite agendas, & I usually buy my stickers from Etsy, Red Bubble, and Bando.