Let me just apoligize right up front here, because I know I will offend some, but kids are not dogs! Yes, I do have childern, mine are 6 and 7 now. But if you can hold a leash, why can't you just hold a hand. I really don't like those leashes for kids. Even my own kids have commented about them and asked "why do those people treat thier kids like animals?" Once again I am sorry if I offend anyone, those things just really bother me.
As for my reccomendations for the OP, I would say rent or buy a double stroller. We used a double stroller that we had bought here at home up until the time our kids were 5 and 6 and it really came in handy. Especially since you have the 3 year old. If it was just the 6 year I would just suggest holding thier hand, but since you have the 3 year old as well, you might as well get the stroller. We chose to buy a double stroller because we were there for 10 days and for the rental price of a double stroller for 10 days we could have bought 2 strollers and this way we have it for the walk in the airport as well as the walk from the hotel room to the bus stop and the bus stop to the front gate.
I would also second what others have suggested about attaching something to the child with some contact information. The other thing you need to explain to him is what to do if he gets seperated. He needs to find a person that works there with a while name tag on. (Point out one of the CM name tags when you first get to WDW.)
As for my reccomendations for the OP, I would say rent or buy a double stroller. We used a double stroller that we had bought here at home up until the time our kids were 5 and 6 and it really came in handy. Especially since you have the 3 year old. If it was just the 6 year I would just suggest holding thier hand, but since you have the 3 year old as well, you might as well get the stroller. We chose to buy a double stroller because we were there for 10 days and for the rental price of a double stroller for 10 days we could have bought 2 strollers and this way we have it for the walk in the airport as well as the walk from the hotel room to the bus stop and the bus stop to the front gate.
I would also second what others have suggested about attaching something to the child with some contact information. The other thing you need to explain to him is what to do if he gets seperated. He needs to find a person that works there with a while name tag on. (Point out one of the CM name tags when you first get to WDW.)