For single activity sessions, anything that will be a fun way for your family to interact with each other is a good option. It’s completely up to you, but more active options do tend to make for more varied photos, so anything where you’ll be out of the house and moving around together is a great choice. For half and full day sessions, fitting some planned activities in is still a good idea, but don’t skip the things your family does in your daily life. Eating breakfast together, taking the dog for a walk, putting the baby to sleep, helping with homework, or anything else that’s just part of your real life can and should be included.