### Instruction:
When did the Post Office in Mission Beach first open?

### Input:
In the late 1920s after the construction of a road from El Arish, the area became a popular camping place. It was known as Mission Beach due to the mistaken belief that the Hull River Aboriginal Settlement previously located in the region was a religious mission. Mission Beach developed into a town during the 1940s and 50s with the Mission Beach Post Office opening on 15 December 1949.

### Response:
Mission Beach Post Office opened on 15 December 1949.