Does anyone know if you can bring your own tubes to castaway Cay and have the disney cast members blow them up for you with their air ? We would like to bring our own two person tubes but don't want to spend the day blowing it up? :

I don't know if they will inflate them for you, but you can definately bring your own. You might want to looks for a small portable inflator. They make them for bicyclists, etc, and that might solve the problem for you.

I think you can bring any toys, but I don't know if they'll blow them up for you -- you might want to call DCL. It might be easier to rent, unless you have oodles of room in your suitcase. Right now they have these rental options;
Float/Tube Rentals (All Day)
Bob in the gently rolling waves on a float or inner tube, available for rent by the day.
Children under 13 years of age must be accompanied by an adult.
Adult Price: $6
Child Price: $6 (ages 5 and above)
or this:
Castaway Cay Getaway Package
Get all the fun under the sun for one convenient rate! Package includes snorkel equipment and float rental for the entire day, plus a 1-hour bicycle rental.
Children under 13 must be accompanied by an adult.
Adult Price: $32 (ages 10 and above)
Child Price: $16 (ages 5-9)

thank you for the help. I hope to bring one along, it's actually a big figure 8 made for snow and water. both my children could float together, it would be easier to keep track of them on one float! uninflated it takes up no room but I just don't want to have to sit and blow it up myself. I will look into the portable compresser.
I think you can bring any toys, but I don't know if they'll blow them up for you -- you might want to call DCL. It might be easier to rent, unless you have oodles of room in your suitcase. Right now they have these rental options;