The best replacement for steps is stairs.

The best alternatives to steps are rated as following:
★★★★★  stairs
★  s club 7
★  ramps
  running boards
  procedure
  moves
  stages
  ladders
  concrete steps
  scientific method
  strides

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

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



Google Trends

Scale is based on the average worldwide traffic of steps in all years. Click on graph for more.
steps
stairs
s club 7