What to do on a sunny day with family?

Answer 1

Water gun fight, go to an outdoor pool, water balloon fight, run around in a sprinkler, play with friends outside, have a picnic, go out on a hike/walk/jog, rollerskate, ride your bike, get your pool out and jump in it, tan, go to the beach.

OR you could do fun running games suck as tag(it), wolf, manhunt (try to play man hunt all day until the night as in the night it will be epicly fun), capture the flag, Hide & Seek in the dark or during the day.

Or go to a nice giant park, public park, for example hyde park or central park ( wherever you live) and go for a nice family outing doing activities on the way

OR

Theme park.