Why didn't we think of this ages ago? Take two of the most relaxing things out there, hammocks and hot tubs, and put them together and you get the Hydro Hammock.
It's like a portable hot tub that you can take almost anywhere, except in this one you don't have to be in a sitting position. You can lay back, stretch your feet all the way out and breathe in the fresh scent of the outdoors.
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It's made from "waterproof high-tensile strength marine quality canvas," according to its website, and it'll cost you $360. But you'll need the water heating system as well -- and that'll set you back $1,395. So as amazing and luxurious as it is, it's definitely not cheap.