The best replacement for skateboarding is snowboarding.

The best alternatives to skateboarding are rated as following:
★★★★★  snowboarding
★★★★  bmx
★★★★  longboarding
★★★  rollerblading
★★★  biking
★★  surfing
★  inline skating
★  scootering
★  inline
★  parkour
★  skating
★  snowboarding harder
  aggressive inline
  longboarding better
  longboarding- which is better

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

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



Google Trends

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