What Rafting in Zagreb are good for avoiding crowds?

These hidden gems in Zagreb may have limited interaction with crowds: <br/><ul><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Zagreb/Plitvice-lakes-and-Rastoke-Village/d5391-266389P2" target="_blank" rel="noopener">Plitvice and Rastoke day trip from Zagreb w/ticket (guar. dep.)</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Zagreb/Ljubljana-and-Bled-Small-Group-Day-Tour-from-Zagreb/d5391-7125P25" target="_blank" rel="noopener">Ljubljana and Bled Lake - small group - day tour from Zagreb</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Central-Croatia/DRAVA-RAFTING-SAFARI-UPPER-STREAM/d27085-115654P2" target="_blank" rel="noopener nofollow">Drava Rafting Safari</a></li></ul>