Unfortunately the price of the Bonaire Nature Fee went up significantly just a few years ago.  The visitor tax replaces the prior tourist tax and is $75 (2022/time of writing) per person.  More about that @ https://tourismtax.bonairegov.com/.

Please be careful who you pay this tax too – there are scam internet sites taking money and they are not affiliated or official in any way whatsoever. You’ll just end up paying twice.