Just to let you know the Ibis at Hua Hin is opening as of next week and has some decent opening prices - around £22 ($30) per night, not including brekkie. It seems to be down south near the Hyatt Regency, 2 miles from the railway station, but only one block back from the beach. It also has an outdoor pool.
I've booked three days here and with 12% cashback and the 10% hotels.com

Rewards lumped in, it's an absolute steal for a brand new hotel. Can't wait!