DS1 is going into kindergarten next year. He's playing tball this spring, and did karate during the year once per week. He really enjoys both activities. Our rule is one activity at a time (so we stopped karate when tball began) and right now, nothing in the summer. However, part of my brain is succumbing to the craziness of American family lives and the way of thinking for our kids, and I'm wondering should I have him do soccer in the fall too, swim lessons maybe, other activities.... to give him a chance to try things out? Or should we just stick with a couple of things we know he likes and not worry about exposing him to every option? He's also really into art and the outdoors, so of course, my brain is thinking there could be cub scouts and art lessons down the road too. How many activities do your kids do? How do you balance giving your kids exposure to things and having them involved in some organized activities, while maintaining your own sanity? I know some parents who are happy doing at least one activity a day, and can go, go, go, but that is not us. Once a week, twice max is what we can handle!

Re: Kids' Activities
I can't imagine having to rush to more than one weeknight activities at this age plus one weekend activity, my commute is an hour each way so until there is an activity they are really really interested and engaged in, I don't want to spend all our time running around to 'try things out'.
Generally he has done one or two activities at a time, sometimes three if there is some overlap between when one begins and the next ends. Now that he plays at a travel/club level, he is limited to one sport per season plus cub scouts. But honestly cub scouts has really been suffering lately as sports usually wins out over scouts when there is a conflict. So we may drop that after this year.
I would definitely keep up the swim lessons. If you can swing soccer too at this age, and your LO wants to try it out, it should be only once or twice a week for the younger age groups. I don't think I would do any more than that though.