J.P.
I'm not sure where you live but you might check out the website Around Town Kids. It has activities for the Frisco, Allen, and McKinney area. They have a newsletter they mail with activities and on their website they have a calendar that you can click on each date and it will give a list of events going on in the metroplex. If we don't have anything going on and I need an idea I check out that calendar. There is also a coupon section.
Some other places Sharkarosa, Gainsville has a zoo(can't remember the name), Sci-Tech, and Heard Museum. If you google "pick your own fruits and vegetables" there is a website that will tell you farms that you can go to to pick your own produce. It has a list of counties all of Texas and other states and lists of when each produce is in season. Most of the farms are closed right now becuase of the heat, but many of them will be opening in the fall.
Have fun with your little one!
JP