The best replacement for float tube is kayak.

The best alternatives to float tube are rated as following:
★★★★★  kayak
★★★★★  pontoon boat
★★★★  pontoon
★  kayak fishing
  quad rail

Your alternative for float tube is not listed? Suggest!
Speaking about float tube, one probably shouldn't forget about waders.

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



Google Trends

Scale is based on the average worldwide traffic of float tube in all years. Click on graph for more.
float tube
kayak
pontoon boat