The best replacement for swimming pool is hot tub.

The best alternatives to swimming pool are rated as following:
★★★★★  hot tub
★★  boat
★  spa
★  swim spa
★  open water
  trampoline
  pond
  sea water
  above ground
  fiberglass
  inground swimming pool
  gun which is more dangerous
  above ground swimming pool

Your alternative for swimming pool is not listed? Suggest!
Speaking about swimming pool, one probably shouldn't forget about jacuzzi.

Other search terms related to swimming pool and their ratings are:
★★★★★ jacuzzi
★ slides hertfordshire
You have in mind a companion for swimming pool and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of swimming pool in all years. Click on graph for more.
swimming pool
hot tub
boat