It's not on anything, it's giving councils power to raise levies where they see fit.
This is literally the full text of the proposal, anything else you've heard is just someone spinning it to get you whipped up:
We propose that a visitor levy will be a small additional charge to be levied on visitors staying overnight in visitor accommodation.
Any final decisions on how the levy will be applied will be taken following extensive scrutiny and a vote in the Senedd.
We believe it is fair and reasonable to ask visitors to make a contribution towards the wider costs of tourism. Our intention is to foster a sense of shared responsibility between residents and visitors, to protect, and invest in, local areas. Where a levy is used in Wales it should encourage a more sustainable approach to tourism.
We know that tourism plays a vital role in supporting local economies. But unbalanced, poorly supported tourism can also put pressure on local communities and undermine the visitor experience.
A visitor levy is not intended to put people off visiting Wales. Instead, we propose that it would be a small contribution by overnight visitors that will generate additional revenue for local authorities to reinvest in local communities. This would enable them to address some of the costs associated with tourism and encourage a more sustainable approach.