Really just too nasty to go outside? Pretend you're outside anyway with a picnic lunch, which, let's face it, is not much fun even in a light rain. Is that going to stop us? NEVER!
Prepare your picnic lunch as usual and pack it in a basket. Then find that perfect picnic place in the house. Is your living room suddenly a grassy meadow high atop a mountain? Or perhaps the family room has magically become a sandy beach with palm trees sheltering you from the sun? Spread your blanket and talk about all the wonderful sights and sounds around you. Do you hear the ocean? Is that an eagle flying over there? Indoor picnics are fun and ant-free (unless you invite them yourselves!)
A good camping trip is fun, too. Dining rooms chairs, sheets, blankets, and pillows artfully arranged make a dandy indoor tent. Get out a flashlight and huddle in your tent telling spooky stories or playing with hand shadows. Sing camp songs. If nap time is still part of your day, catch a snooze inside the tent!