There is a complementary shuttle bus service from Black Mountain to downtown Hua Hin.
The bus departs from the garage at Black Mountain.

Departure times: 

11.00
12.30
13.30
14.30
15.30
16.30
18.30

The ride to Hua Hin takes about 20 minutes.

There is no shuttle service from Hua Hin to Black Mountain. Taxi/tuk-tuk cost about 400 bath one way.