Honestly, I probably wouldn't go to the wedding. I think that, like other people have said, when you decide on a destination wedding (
especially one that's out of the country!) you're kind of guaranteeing a bunch of people won't come.
My fiance and I want to be able to spend our wedding with ALL of our family and friends, so we're having it at a church that's convenient for everyone to attend. We decided to overlook a Disney wedding for this reason, and instead we will be going to Disney and on a
Disney Cruise after our wedding.
I think that if you have to get onto a public forum and ask opinions of people you probably don't want to go, and that's ok. I would just go to Disney. If you're really super super close to your brother, then maybe I would choose the wedding over the vacation, but you can always see pictures.