Once more with feeling: What you are doing has NO LEGAL SIGNIFICANCE to any country, including Belize. The act of getting married has legal significance and legal requirements and legal paperwork. But you are already married. Therefore you are not "getting married."
Your decision to have a ceremonial re-affirmation of your vows has personal significance to you and your spouse but it is a NON EVENT from a legal standpoint. You can do this anytime you want, anywhere in the world you want, with anyone else participating or nobody participating. If you want to have a clergy person participate for some reason, you can invite one to do so and if he or she wants to they will and if they don't they won't. No third party is legally required since what you are doing has no legal significance and hence is a non event legally speaking.
You can have a dinner or not, music or not, flowers or not, photographer or not, etc. etc. You can have it at the dinner table, on the beach, on your hotel balcony, or wherever. Its up to you and your personal tastes and your wallet. It is like any other personal celebration or party from a logistical standpoint.