Adjective meaning "disposable" that sounds more eco-friendly

Solution 1:

Regardless of whether your product can actually be broken down by living organisms, you could use biodegradable, a marketing term which carries a strong connotation of having minimal environmental impact:

The biodegradable [product] for hotel guests!

Also, I don't think recyclable is easily confused with reusable. If your product is not designed to be thrown away, but rather to be reprocessed so other things can be made from it, you absolutely should use the word recyclable. If you wanted to specify that the product should only be used in the short-term (and it isn't obvious from the product itself), you could potentially say single-use:

The single-use recyclable [product] for hotel guests!