The best replacement for tents is hammocks.

The best alternatives to tents are rated as following:
★★★★★  hammocks
★★★★  tarps
★★★★  canopy
★★★★  canopies
★★★  gazebos
★★★  frame tents
★★★  springbar
★★  pole tents
★★  kodiak tents
★  coleman tents
★  eureka
★  cabanas
★  shelters
★  montana canvas wall tents
  double wall tents
  ez up
  coleman
  gazebo
  canopy tents
  campers

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

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



Google Trends

Scale is based on the average worldwide traffic of tents in all years. Click on graph for more.
tents
hammocks
tarps