Awesome Loft Beds--Since you won't have a window on the one end of your upstairs, this could be a fun idea for the kids area. Not necessarily a bed, but a 'loft' on top of a 'hide-out' area---or something. The bookshelf stairs are a neat idea too.
Loft Bed Workstation: Perfect for Students & Small Spaces
I really like this idea for a kids room. Ive always loved the idea of loft beds, but putting a curtain to cover and it becomes a special alone space. I did this but with a normal bed. I laid underneath but with less room than this.
Turn a small courtyard into a sanctuary by adding an outdoor hot tub! Fun view of spa pool from above. I would have a hot tub like this! It's private and looks so nice rather than those ugly big plastic things.