So, I just ordered custom t-shirts from Vistaprint (less than $30 for all 5 shipped!) The shirts are plain white with text. Youngest DD's says "SeaWorld", DS's says "
Legoland", DH's says "California Adventure" and mine says "
Disneyland". We are all going to wear them to DD's bday party, hidden under a hoodie or something. I will wrap oldest DD's shirt and it says "I'm going to". I'll make sure it's the last present she opens and as she's working on removing the many layers of wrapping paper I'll use the other 4 of us will be removing our hoodies. I'm hoping that when DD opens her shirt and reads "I'm going to" then looks around puzzled she'll figure it out that our shirts are the destinations for her surprise trip!