Looks like you might be able to do some fishing at Lake Martin in or around the Launch.
This time of the year though fishing might be tough for bank fishing just due to the high heat. You would have to go out early am or late pm when things cool off.
You could also start building them a couple of small kayaks and or pirogue like I did.
Got my plans from here. www.jemwatercraft.com
i dont know if you crab. but kids have a blast doing it, and you aint far from good fishing and crabing spots. like Grits mentioned ....i would head toward pecan island area, plenty of places to bank fish and crab. well, now you got me worried about your kids....freaken gators are out. na, go to lake martin or spanish lake....