To dry nails quickly, did you know if you have a bowl of ice water and wiggle the just polished nails in the iced water, the nails will dry within about a minute? Some boys may want their nails polished, have some dark colors or see if you can find "Longhorn Burnt Orange". (I think they sell it at the Co-OP, call them)
Boys like active games. Be sure to have a race of some sort and mix boys and girls. Do not let them pick teams! Have their names in a bowl and call out the names to randomly make up 2 teams.
We liked to do a race where the kids have to take off their shoes and put them in a pile, mix them all up in 2 piles. Then when you yell "Go" the teams run to their pile of shoes and have to find and then put on their shoes.
Tug of war is also always good.
A Pinata filled with candy, stickers, banaides. See below for Bag idea.
Treasure hunts are fun. Hand out bags and let the kids decorate them with stickers, have them write their names on them. Make up a map and give each child the map. hide enough treasure at each location that each child can take one at each stop.
Maybe instead of tattoos for the boys you could get a friend or hire a High school student to do face painting?
We found kids are crazy about make your own sundaes.
We purchase the little ice cream cups and let them pile on toppings. Because the cups are small a few kids will eat 2.
Remember kids like just playing with each other. Have sports balls, play kitchen and other things that your kids play with outside. You do not have to have an activity at every moment.
Have fun and take tons of photos. Be sure to post them online so the other parents can order them if they want. You can also email them to Walgreens and the parents or Grandparents can see and order them from any Walgreens in the country.