I think it depends on how special you want it to be and how much your budget is. You may consider a birthday organising company. I had organised my son's birthdayparty with a company called Happy Happy Birthday (
www.happyhappybirthday.com.hk, Tel: 9855-5243 Ms. Leung) They gave me a lot of ideas, they also havedifferent options for different budget. My son had a lovely birthday party andlots of beautiful memories for him and for me as a parent.