You pre-order your cd from the website, then go to the parks. There are photographers everywhere and you just go up to them and get as many photos as you like. The first one you see will give you a card, and you give this card to each subsequent photographer.
You can have as many cards as you like and I recommend you take a picture of the code on the back in case you lose it.
Get as many photos taken as you can.
When you get back, log on to the photopass site and enter your card number/s. Your pictures will come up and you can add characters, signatures and borders to as many as you like. You then order the cd.
If you have too many photos for one cd, they'll just send more than one with no extra charge.
If you want the photo book you can get it much cheaper if you pre-order the cd and the book together. That's what I'll be doing.
If you think that 5 photos bought seperately would cost around the same as the cd, you'll know it's a real bargain. And you've got the added bonus of everyone in every photo rather than the same person behind the camera in every shot (normally me lol).