The Oxford Thesaurus An A-Z Dictionary of Synonyms - restful adj.

1) relaxing, soothing, comforting, tranquillizing, sedative, calming, sleep-inducing, hypnotic, soporific, somnolent: Don't you find the sound of the waves restful? 2 tranquil, calm, peaceful, quiet, still, serene, pacific, comfortable, relaxed, reposeful: After a hectic day in the city, I was happy to return to the restful atmosphere of the country.