Hi Ashley, are you looking to host small kids, babies or older kids?
Babies:
- somewhere safe for them to sleep (a collapsible baby travel cot or similar)
- a high chair
Also nice:
- somewhere to change their diaper, maybe somewhere to dispose of their diapers
- a baby bath tub (possibly collapsible)
Slightly bigger children:
- a potty
- a seat for the toilet
- high chair or kids chair
- puzzles, coloring pencils & paper, age appropriate games
- a stool in the bathroom to reach the sink
- a bed they can't fall out of
Bigger kids:
- a swing
- puzzles, coloring pencils & paper, age appropriate games
That's my suggestions...