I check one bag and bring a small carry on.
I don't pay for luggage, and I don't mind waiting in line if it means I have everything I need right there with me. I'm on vacation, I'm allowed 50 lbs (my case is usually about 35 pounds when I weigh in) and I'm waiting in line anyway, so I don't skimp on what I bring (I'm not excessive, but it's not like I'm backpacking, yuh know!)
I don't think I've ever brought anything unusual, but this year I want to bring some solar powered twinkle lights to decorate my patio, maybe.