The theme use woocommerce plugin and utilizes their core ecommerce functionalities for most of the shop modules, with custom functions and templating to suit the needs of tour booking.
Now if you remove the price, as you are indicating in your screenshot, what happens when the user clicks the “BOOK NOW” button? Should it still function normally, like add to cart and go to cart page? Or are you/have you removed the cart icon as well. So, will you be adding all the products only as affiliate products? In which case provide URL for all the products to go to certain page, or other site?
Should the price continue to be shown on the listing templates, the sliders, recently viewed and other areas of site, as these are all different template parts? All of these requires the UX research of its own. And bundling every option for individual needs would be far from ideal, because this would make the theme heavy for all the users.
Hence, such features are best dealt on customization basis, rather than to add them on top of the theme for every user bloating the theme.
Having said all that, if you are just after removing the price from tour detail pages, the part shown in red circle in your screenshot, and nothing else that I have mentioned above matters, I will help with that as that should just be one line of code, or two!
Sorry for long reply and hope all this makes sense, but if you are still unsatisfied, please don’t hesitate to let me know.