(Besides wearing tutus all day, with optional snow boots, of course)...
A plateful of shaving cream, that's what.
Silence the voice in your head that is whispering "But the mess!!" It's really easy to clean up; it just wipes off with a wet cloth! It's worth the entertainment value...I got two hours, easy, of no-fighting, lots-of-giggling play time out of these two little women.
Shaving cream mustaches and beards. Shaving cream polka-dots on arms and legs. Scoop it into smaller containers, then add water and stir till it looks like whipped cream. Spread it back on the plate and put it in the wood stove oven like a pie. It's so delightfully squishy.
If you have a little one who is learning letters and numbers, you could even spread it on a baking sheet and have them write in it. So. Much. FUN!
And the post-shaving-cream-play bath was fun, too.