Spas with reservation required in Thailand

Phuket

A compact day spa on Thalang Road in Phuket Old Town offering rose-petal jacuzzi baths and coconut milk soaks, geared toward couples, open daily 10am–11pm.

Koh Phangan, Surat Thani

Day spa in Ban Tai, Koh Phangan, with massages, baths and multi-hour packages for solo guests or couples, plus private suites and a sauna.

Koh Samui, Surat Thani

A day spa in Bo Phut, Koh Samui, open daily 9am to 11pm with a sauna and traditional Thai treatments for solo visitors and couples.

Krabi

A moderately priced onsen-style day spa in Ao Nang, Krabi, open daily from late morning into the night.

Ranong

A budget-friendly hot springs spot in Ranong, open daily 10am to 8pm, with walk-ins accepted though calling ahead is recommended.