It’s surely an even better tour than the ones that only check out Sandoval Lake (which you'll be able to very easily do on a day journey from Puerto Maldonado due to its close proximity.) You could guide it on line for $512 USD and check the opinions in this https://peru-amazon-tours-puerto40481.jts-blog.com/30690488/a-simple-key-for-puerto-maldonado-amazon-tours-unveiled