We stayed at Marriott at The Empire Place, a short walk away from Health Land Sathorn. Tried walking in on our first night there and they only had foot massages available, so we made reservations for another day. Best to make reservations in advance especially in a big group, as their slots fill up quite quickly.
Professional service and we paid upon arrival. Didn’t have any issues with not tipping the masseurs - maybe it depends on the masseur. Reasonably priced for the service you get. Would love to return again!