To start early on January 1, Jintana Herb Sauna opens at 08:30. Its alternation of hot herbal sauna and cold rest suits a light, sweaty start the day after the countdown, and AvaniWell and The Standard open at 09:00.
If you can travel to Pranburi, look at Blue Lotus at Wyndham. Steam and sauna before treatment (adults only) and garden-view rooms set it apart from the town spas. It closes at 19:00, so use it for a daytime plan.
For a big party, AvaniWell is the most comfortable, taking up to 12 at once and open until 21:00. For privacy, InterContinental's stand-alone suites and The Standard's small garden rooms fit.
For an evening in town, 99 Thai Massage is open latest, until 22:00. Anantara closes at 19:00, so use it for the daytime on December 31.
Before booking, confirm the last booking time and whether a room is guaranteed. Holiday hours can change, so use the current product details as the reference.