The lavish 227 guest quarters at the St. Regis Bangkok (doubles from $470) are studies in painted teak and marble, but unrivaled service sets the property apart. Next door, the Hansar Bangkok (3 Rajadamri Rd.; 66-2/209-1234; doubles from $350) feels more resort-like, with 94 suites decorated in subdued silks; some rooms even have cantilevered nooks furnished with daybeds. Near the Sathorn business district, Anantara Bangkok Sathorn (36 Narathiwat-Ratchanakarin Rd.; 66-2/210-9000; doubles from $320) lures both businessmen and weekenders with its large-scale rooms and outdoor infinity pool, where a butler dispenses cold towels and Evian mist. Asadang (94 Asadang Rd.; 66-2/622-2239; doubles from $110), a four-month-old hotel in the historic district, channels Old Bangkok in a restored 19th-century mansion. Husband-and-wife architects Direk and Chitlada Senghluang fitted the nine intimate rooms with antique furnishings and photographs of Siamese nobles. Opening this fall on the Chao Phraya River: the Siam (Thanon Khao; doubles from $500), the brainchild of Thai-American music sensation Krissada Sukosol Clapp. Set on three acres of landscaped gardens, the 39-suite property includes four traditional teakwood houses salvaged by silk designer Jim Thompson.