Would you map the journey for a specific section of a website?

We're looking to redesign a destinations section of a travel website as the current is basically an import of our brochure and doesn't work for web. We have all the analytics, customer research videos, heatmaps etc - so a lot of research on how what we have is not working.

Coming further into the project, I'm wondering would we need to map out the customer journey, when destinations are only 10% of the overall customer journey of the website? Would it be feasible to start moving into the sketching phase of the design process and conduct usability tests on the new, potential design going forward?

What would be the best practice in this situation?