We go out after naptime and stay out till kids are picked up. I put a note on the door and parents meet us in the back yard. By waiting the yard is 3/4 shaded and the grass is dry so much nicer for play. It also means the pockets and cuffs and shoes full of sand go home instead of back into my house. In summer we eat snack outside too. I care for little ones and allow morning naps so this way our routine doesn't need to change. It also means less need for sunscreen and some parents have simply said don't bother. In winter I sometimes let the older ones go out just after lunch if my daughter comes over and then they come in for nap. This way it is the warmest part of the day.