How much spending money is all a matter of what type of stuff you want to do.
You didn't mention if you were on a dining plan or not so that would take up a huge amount of your spending...
Food: I would recommend looking at some of the menus at the restaurants you will be dining at to get an idea of prices.
Breakfast (CS): $9/pp
Lunch (CS): $12/pp
Dinner (TS): $35/pp (no alcohol)
Remember tips are not included in the dining plan.
** We were on the basic dining plan but budgeted about $20 for each table service meal for three adults. We also bought some breakfast stuff from the hotel store, milk, bagels, cereal, etc. And we budgeted for the "free-refill" cup ($13/pp)
Tours: If you will be doing any backstage stuff or segway tours plan on those too...
** We did the Keys to the Kingdom Tour which I think was $60/pp and included a CS lunch.
Trinkets: Depends on what you see and when...
** I did a lot of ebaying for t-shirts, light spinners, and stuff and brought those with me to wear and enjoy. I bought some music CD's and key chains don't think I spend more then $60 on trinkets.
Photos: Will you be purchasing any of the photos at the end of the rides?
** Prepurchased the photopass CD, but was not happy with the number of photos we had on the CD, so I got a refund on that.
I know I'm not giving you specifics for your upcomming trip, but hopefully what we did on our trip in Sept '08 will assist in giving you things to keep in mind while you plan out your spending money.
Wishing you a safe and magical time!!
