I recently spent three weeks in Hua Hin and a weekend in Bangkok. I had never been to Hua Hin before and went there to do a Muay Thai Fitness vacation. I worked quite hard and enjoyed my time. I got to see a bit of Hua Hin, but hope to go back in December to do some bicycle tours along the coast.
The serviced apartment I stayed in was quite new (about a year old). It was very clean and had a great pool. It was 1400 baht per night and the room was cleaned everyday. They included a free litre of water everyday. It also had a balcony overlooking the pool.
Nearby temple - I walked by this everyday and loved how the sun rose and set behind it.