I'm still new to the Dallas metro area, I live in Plano, but maybe there are some community pools you could go to in Wylie, I know at Oak Point in Plano, there is a nice swimming area that cost $3.00 for kids, your babies will be free and it's $6.00 for adults, it's open from 1-5:45 PM, which is plenty of time to be in the sun. Also, check out the zoo, I know last week or the week before the Dallas zoo had dollar days, where it cost a dollar to get in. Also, riding the DART, kids seem to like that and it's air condition. Walking around in Malls are fun, a lot of them have the areas where little ones can play, or going to McDonalds or places like that, get some Ice Cream and let them play for hour our so... There is also the dollar movies in Plano, sure some surrounding areas as well...I don't know all the lakes in the Dallas areas, but I'm sure a lot of them are free to go too, just have fun in the water and wear lots of sun screen.