"Family is like branches on tree, We all grow in different directions yet our root remains as one"
Out door activities in my opinion is the best thing to do for our kids. I was grew up in tropical country with mostly sunshine almost whole year... Even when it rainy season, me and my siblings also some neighbor's kids played under the rains without worrying and guilty feeling from our parents.... and guest what?! We hardly ever got heavy/ serious sickness due to those activities.
Maybe because playing out side require many physical activities which influence increasing immune system for our body. And beside that out door activities may reduce kid's stress.
And kids in my era (around 70~80's) there was not any electronic gadget like phone or any fancy toys like now days. We were simply happy play with mud, sand, kite, bike, snail, grass or anything we found ^,^
Surely every kids have their own era just like we do.
My kid doesn't go to school yet, hence in summer time regularly I take her to park to play. But sometimes even in winter with thick snow I'll let her play with snow for few minutes. But that's it... not really much can do out door in winter.. so mostly I tried to make her busy in home.