The best replacement for surfboard is fiberglass.

The best alternatives to surfboard are rated as following:
★★★★★  fiberglass
★★★★  bodyboard
★★★★  paddleboard
★★★  longboard
★★★  surfbort
★★  skimboard
★★  surfboard
★★  surf board
★  sup
★  twintip
★  boogie board
★  arris
★  foam surfboard
  twin tip
  fish surfboard
  short surfboard
  shortboard
  funboard
  fiberglass surfboard

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

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



Google Trends

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