The best replacement for sup is kayak.

The best alternatives to sup are rated as following:
★★★★★  kayak
★★★★  surfing
★★★  cup
★★★  surfers
★★  mutt
★★  max
★  kayak fishing
★  prone
★  longboard
★  inflatable sup
★  fiberglass sup
★  404 sup
  kayak speed
  dine
  syclo
  sup
  bark sup
  surfboard
  windsurfing

Your alternative for sup is not listed? Suggest!
Speaking about sup, one probably shouldn't forget about whack playstation sup.

Other search terms related to sup and their ratings are:
★★★★★ whack playstation sup
★★ wack playstation sup
You have in mind a companion for sup and it is not yet here? Propose!



Google Trends

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