My girls were 11 and 13 the first time we let them go to the MK alone while we stayed at the hotel(me, my ex, and DD3). It was about 3pm in May and told them to be back by 6:30pm, this was 10 yrs ago so cellphones were not the norm or as cheap as they are today. The girls showed up at 6:00pm. My oldest said we didn't want you to worry so we came back early. We live in FL and 90% of the time our vacations are to Disney(we had gone 5 times that year, Love APs). The girls knew where everything was very well. The only time I "freaked" was during the worst day in American History during our lifetime, September 11, 2001. The girls were 17, 15, and 8. DD8 and I got up earlier to go to MK, my other girls were thinking about going to BB(it would be their first time), but they knew they wanted to go to MGM and ride ToT. I never turned on the TV that morning so I had no clue what had happened. MK was empty. We had just gotten off of HM and decided to get a drink. MK made an announcement to head for the park entrance (I thought it was a test drill). When we got on the bus, thats when I found out what happened. Immediately I thought about my older girls. Where were they and were they ok? I rushed back to our room at POR and there they were, They had taken the bus to MGM where the bus turned around and took everyone back to the resort. After that day my girls never wanted to stay at POR ever again. It was back to the Values for us.
I gave my daughters some freedom, didn't mean I was treating them like adults(now they are 23, 21 and 13). Heck, I never let them get their full Driver licenses, they did it after they turned 18. Flame if you want but no one knows your children as well as you. My kids were responsible enough to go to Disney Parks alone. LOL I've never let them go to the beach alone, it was always ok I'll sit 30 ft behind you but I am going too. My girls still talk about the time they went to the parks alone. Worst thing they did, pretend they were babyswapping (they didn't give you a pass back then as they do now). They still get a kick out of that.