The best replacement for onsen is sento.

The best alternatives to onsen are rated as following:

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Speaking about onsen, one probably shouldn't forget about ryokan.

Other search terms related to onsen and their ratings are:

★★★★★	ryokan
★	ryokan near tokyo

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Scale is based on the average worldwide traffic of onsen in all years. Click on graph for more.

onsen

sento

niseko