A.L.
Hi J.
Do you live near a Y? if so, can you get the kids into swim classes? Also, the Y has daycare where you can put the kids while you workout. This might give them a chance to play with other kids and you the chance to meet other people in whatever classes you take, What I like about the Y is that you pay one fee and then can go to as many classes as you like... which of course, the more you attend the cheaper it is. Plus, they tend to be more family oriented and put on different events.. maybe give it a try. they may even have a day or week pass for free..
good luck