Hi Sherri,
I saw that you've directed your question to Cathy. I've had experience with your questions so I hope you don't mind if I assist you. When you mention preferred viewing for wheelchairs, I'm assuming that you're talking about parade and fireworks viewing at the Magic Kingdom (please let me know if you are asking about something different). There are three areas designated along the parade route for Guests with disabilities: one in Town Square, one on the inside of the hub in front of Cinderella Castle & one in Liberty Square across from The Hall of Presidents near Liberty Tree Tavern. These areas are 1st-come, 1st-served. Plan to arrive early as space is limited & spaces cannot be reserved or guaranteed. Parties larger than 6 may be asked to separate if its super crowded. Be sure to pick up a Guide for Guests with Disabilities for MK when you enter - it will show you these locations.
The Fireworks Dessert Party is AMAZING! I recently answered another question with details of this experience - click
here. They are currently booking through 12-29-10. To book a reservation call Disney Dining at 407-WDW-DINE. Pre-payment is required at the time of booking.
Prices are seasonal and can range from $21.99 (ages 10 & up) & $11.99 (ages 3 - 9) to $27.68 (ages 10 & up) to $14.90 (ages 3 - 9). Magic Kingdom Theme Park admission is also required & is not included in the price of the dessert party. The Tomorrowland Terrace is handicapped accessible so you won't have a problem there.
If you'd like me to check on pricing for specific dates, let me know your dates of travel & I'd be happy to do that for you. Wishing you many magical memories :-) Allison