Dress Code for Amazon Cruise - Iberostar?

I have a friend who will be going on the Iberstar for an Amazon cruise. She is wondering what the dress code will be like. Looking at their website (https://www.rainforestcruises.com/iberostar-grand-amazon-cruise/). It looks quite informal, but perhaps a bit more "country club casual" during the evenings?

The only clothing reference I found on their website is

"Please note that specific to the Iberostar Grand Amazon, there is a maximum allowance of 2 pieces of luggage per person. In addition to this, gentlemen should also be aware that they are not allowed to wear shorts to dinner in the Restaurant Kuarup, so please pack a pair of pants accordingly."

If anyone has any advice on this, or general advice for someone going on an Amazon cruise, I would appreciate your input so I can pass it along.

Thanks in advance.

You need comfortable clothes. Don't be affraid about the mosquitoes - I did not experience any in January, as well as the rains (it was only once).

The ship is very good with spacious cabins. Food is also excellent.

Try to get to the group with Jefferson. He is the best guide on board.

Be sure, you are going to have fantastic cruise, one of the best in the Word.

You need comfortable clothes. Don't be affraid about the mosquitoes - I did not experience any in January, as well as the rains (it was only once).

The ship is very good with spacious cabins. Food is also excellent.

Try to get to the group with Jefferson. He is the best guide on board.

Be sure, you are going to have fantastic cruise, one of the best in the Word.

Thanks for the response! I will pass that along.

It sounds like, apart from the "no shorts in the dining room," there is no set dress code?