ONSEN(温泉) or hot spring bath is getting popular with foreign visitor, too. I ready wrote about KINOSAKI-ONSEN as one of my recommendations. Besides it, there are two popular ONSEN resorts. They are ARIMA-ONSEN(有馬温泉) in HYOGO prefecture and SHIRAHAMA-ONSEN(白浜温泉) in WAKAYAMA prefecture.
●From OSAKA station to KINOSAKI-ONSEN,
it takes 2 hours and 40 minutes by an express train.
●From OSAKA staition to ARIMA-ONSEN,
it takes about 1 hour by trains.
●From SHIN-OSAKA station to SHIRAHAMA-ONSEN,
it takes 2 hours and quarter by an express train.