I know the emergency vet clinic on Government St. In Niceville provides cremating services.
They were very kind, returned in a cedar box with a sweet note. 729-3335
Kindred Hearts Pet Crematorium - 850-244-3800 They usually will pick up your pet from a vet's office and return it to the vet's when the pet is ready. If you call they will tell you where to go and what to do. I hope this helps.