Hello @mcleguip,
The WP Travel Plugin by default pulls the default thumbnail size images in archives / trips search and itinerary listings and full size uploaded image in the trip details page.
To resolve the pixelated image issue please try updating your desired image size in your WordPress Dashboard > Settings > media > Image Sizes > Thumbnail Size. Please update the image size to your desired image size and Regenerate thumbnails( https://www.ads-software.com/plugins/regenerate-thumbnails/ ) to check and see if the issue is resolved.
If the issue is not resolved by the steps above, please provide us your Website URL explaining the issue further in the section you are having the issue with so that we can inspect the issue and provide some precise fix.
Best Regards !!
