For the view, Vana Nava Sky Bar Rooftop at Holiday Inn (Hua Hin) is the leading candidate. Set 27 floors up over the Hua Hin coast, it follows a day at the water park naturally, and there is no transfer at all if you are staying at Holiday Inn Vana Nava.
White Lotus Restaurant and Rooftop at Hilton Resort & Spa runs a rooftop alongside the restaurant, so a daytime dim sum buffet also gives you the view. It doubles as an alternative when children or older parents find Thai food heavy going. Check service hours and adult or child pricing.
To fill the afternoon, there is a wide choice of afternoon tea. Afternoon Tea at Hyatt Regency Hua Hin reviews well, while Afternoon tea at Avani+ Hua Hin Resort and Afternoon tea at Anantara Hua Hin Resort each spend the afternoon within their resort gardens - useful on a day without a round of golf.
To keep dinner in a resort restaurant, Lido Restaurant at The Standard, Hua Hin is worth considering. As a design hotel outlet it matches an itinerary weighted toward atmosphere. For a beachside daytime mood instead, Sundance Dayclub Hua Hin is the alternative.
Before booking, confirm the reservation method and service hours, buffet or set structure with adult and child pricing, whether non-guests can dine, dress code and age limits, wet-weather policy for outdoor and rooftop seating, and the cancellation window. Hua Hin has relatively few registered restaurant products, so availability can go quickly during this holiday.