Welcome aboard, Tom! Congratulations on booking your cruise on the Disney Dream for next spring! It sounds like you've been doing some planning already!
The private cabanas on Castaway Cay are wonderful places to relax and unwind while your family enjoys their day on Disney's private island. They are very popular though, so they book up quickly. Prices are subject to change, but right now they are $549 for up to six people on Family Beach. Additional guests, up to 10, are able to be added for an additional charge of $50 each. Cabanas for adults only are available on Serenity Bay for a lesser fee of $399.
If this is your first cruise with Disney, you'll be able to begin your
online check-in 75 days prior to setting sail. During that time, you can view the extras like Private Cabanas or Port Adventures, and add those to your reservation. Just keep in mind that guests who have sailed with Disney previously are able to begin their online check-in and booking those extras 90 or more days in advance, so sometimes the cabanas are sold out quickly.
Even if you don't snag a Private Cabana, I promise you're still in for a wonderful visit to Castaway Cay. In fact, my family has never rented a cabana there, as we like to be on the go, enjoying all of the island and the activities and events. But, we do really like a shady spot on the beach, and it's never been a problem to find the perfect beach spot for our family.
I hope those details help as you continue planning your cruise, Tom! Have a wonderful vacation!