With kids,for safety reasons, I would recommend Windy Point. Once in the camp area, you don’t have to worry about cars coming in and out as you would at Mansfield as it is a major boat launch area. Also, Lake Travis Scuba has relocated to Windy Point. They offer two tank boat dives out on the lake for $40.00. No, I don’t work for them but I have used them often and Robert Weiss, the owner, runs a top notch operation. You do have to provide your gear and tanks. This gives you the option to dive elsewhere on the lake and also from the shore at Windy Point. Windy Point also has air fills there on site.