L.V.
Homestead Farms in Keller has dairy goats. They have regular hours when you can go and visit their animals and everything. Also, they host "farm camps," which are mornings every now and then when kids can come and feed their chickens, help milk their goats (they have a milking machine), and generally see how everything works. It's a really fun experience! They will also do a birthday party the same way. While you're there, you should try some of their milk. It's delicious! :-)