Basement for kids and adults

Hi We are moving into a home and the basement is unfinished. It is apporoximately 1200 square feet and I will be getting the floor plan drawings today. We want a TV/Theatre room with seating, a bathroom, and a kids play area complete with lots of storage, fun activities, and centres or spaces for : Reading, Building (Lego, train tracks,etc), Art (easel, paint, crayons, playdough), activity (an indoor slide and tree house wood be amazing, or something that will make them move and be active), etc. There is insulation and concrete floors right now. Ceiling height is around 8' and there are some ducts but still good height.