Can we skip Singing dunes, Aktau Mountains & Altyn Emel? Or is it a must visit on our 8 day trip?

Hello all we will be travelling to Almaty and were looking at getyourguide and came accross 1-2 days Singing dunes, Aktau Mountains & Altyn Emel Trip, it is costing a lot and the duration is 15hrs.

Is it worth going there or can we skip on it as we do not want to exert ourselves too much.