Have lots of fun!!! I love Disney World! love it! I live here in FL so I get to go there 2 or 3 times a year, but just for weekends. I always leave Bengi with my mom, because it's not fair for him to stay all day alone; I know he has a good time at my mom's and I'm sure I always miss him more that he misses me. I'm sure the same will happen to you, you'll miss Lulu more that she'll miss you, and at least, you won't be too sad when your vacation is over, because you are going to be with her again!
