How do you keep multiples and a older sibling from feeling left out

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I am a mother of 2 year old triplets and a four year old. I have two girls and two boys. We do alot of activities together, however to give them some one on one or more personality related activities some one always feels left out. I take time each day for one on one, do things with just the girls, things with just the boys, 2 kids like to swim, 2 like to go to the lake and so on, my oldest one does more than the triplets because of her age and pre school and dance etc... but it never fails that someones feelings are hurt. I am exhausted by the end of the day and usually behind on house work. I feel that sometimes Im doing them a big injustice by trying to make everything fair.