I'm going to Orlando in October for 10 days, and will be in conference a couple of days, and was wondering what my 13 and 9 yo boys could do without me so they don't have to sit in the hotel the whole time. I will be at OCC on International Dr. so they could ride I-trolley. I've thought of a couple of things, but when I checked into them they had to have an adult accompany them. Could they go to Sea World and look around by themselves? I was at SW a couple of years ago, and I think they would be ok alone there. Discovery Cove, and the tours at SW need to be with an adult. I also thought about Wet-n-Wild. They both have cell phones. They would be together with each other.
I'm sure the answers you got weren't what you hoped for....but one other thing to consider is the legalities of leaving your children on their own. I don't know Florida's laws, but you could call Orlando's police department to inquire, but in my state leaving a child under the age of 10 is against the law. Of course, they only enforce that if they find out, but are you willing to take that chance?
When I was in my 20's (before I had my own kids or was married)....I was a youth group leader at my church. I had several families "hire" me to go on vacation with them. They'd pay my airfare, get a suite so I had my own room, and pay for any recreation I did with the kids (we never did Disney, but we did other amusement parks that were for littler kids). My "job" was to keep the kids entertained. Sometimes it was while one parent was at a conference, like you're doing, but most times it was so mom and dad could enjoy their vacation with some definite adult time. When mom and dad were with the kids I was free to go and do on my own (usually this was at my own cost, but occasionally I got an allowance, lol). Meals with the family were paid by the family, but I opted to give them time together and me time away and bought my own dinner somewhere else. I was never paid like a job....my "payment" was always the free vacation. Occasionally parents would try to give me money, but I only took spending money for when I was with the kids. Your helper may want other arrangements.
If you don't have a family member to bring, you might consider hiring a college age student....though right now they're all gearing up to go back to school so it may be more difficult. But, you never know....you might find one that graduated and doesn't have a job yet....or that's willing to miss a few classes for the chance to have a paid trip to SeaWorld or Disney.
Make sure you're clear about what you're paying for and what you expect them to do. The first time I did this was with the Pastor and his family, and it was a little awkward, but after that I knew what the different parts of such a trip entailed and could easily talk with the other parents about what I expected from them, and what they could expect from me. Don't overload your helper....when your conference is over and you're back with the kids, let him/her go off on their own....they need their own space too.
You might even consider asking an older friend.....a grandmotherly type, so long as they're up to the physical challenge of SeaWorld or Disney, and so long as your kids get along with them! Might just make a great travelling companion for your family and make someone's day at the same time.
If you do decide to leave your kids on their own, it couldn't hurt to go over the different "what ifs" so that it's fresh in their mind what they should be doing if something happens. Make sure they know to stay together no matter how much the other gets on their nerves. You said they had cell phones, so be sure yours is on vibrate so they can reach you anytime (most conferences ask you to shut it off....also check to be sure you have coverage...some of the bigger conference halls either have such thick walls or have devices to block cell phones). Give your kids prepaid credit cards for most of their money, with just a small amount of cash. "Debit" cards are accepted everywhere now-a-days so there is no need for them to have cash that might make them a victim of theft. A prepaid card can have a passcode on it so it's useless to the thief and can be quickly replaced if stolen (so let your kids know unequivically, if someone demands their money, give it to them...then call mom!) I am NOT recommending that you let your kids go off by themselves....just giving you some suggestions if you choose to take the risk.