The best replacement for spas is hot tubs.

The best alternatives to spas are rated as following:
★★★★★  hot tubs
★★  stakeout
★★  jacuzzi
★★  hs10
★★  resorts
★★  ksg
★★  jacuzzi spas
★★  870 bf4
★★  m1014
★  spas
★  sundance spas
★  aa12
★  1887
★  health resorts
★  usas
★  870 bf3
★  hot spring
★  striker
★  striker mw3
★  m1014 mw2
★  camps
★  spaz
★  hot springs
★  model mw3
★  hot springs spas
★  caldera spas
★  salons
  endless pool
  retreats
  hotspring spas
  ksg mw3
  sundance
  marquis spas
  m104
  dream maker spas
  in ground spas
  hotels
  hard spas
  pools
  master spas
  870mcs

Your alternative for spas is not listed? Suggest!
Speaking about spas, one probably shouldn't forget about pools.

Other search terms related to spas and their ratings are:
★★★★★ pools
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Google Trends

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