Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Bangkok (64% of total searches to Gulf of Thailand). The next most popular destinations are Pattaya (22%) and Koh Samui (11%). Searches for hotels in Phu Quoc (3%) are also popular.
KAYAK users have found double rooms in Gulf of Thailand for as cheap as $9 (Bangkok) in the last 3 days. The average price is $116.