Hello @laurenc,
Yes, you can definitely change the title that appears in the frontend through the use of child theme.
You can activate the child theme manually and to know about it please refer to below link.
https://codex.wordpress.org/Child_Themes
You can also activate the child theme using the plugin given below:
https://wordpress.org/plugins/wp-child-theme-generator/
After activating the child theme in your child theme functions.php file add below given codes.
1. To replace the string “Activities” with “Weather and Terrain” and to remove the “pax” from Group Size paste the below-given code in your child theme functions.php file.
https://gist.github.com/anonymous/a28fe3d41e5bf8d7ef411641eb7f7332
Finally to replace the string ” Locations” and “Fixed Departure” paste below-given code.
https://gist.github.com/anonymous/5cc32479878465a7f7698500c13a6b80
Hope this helps.
If you find any confusion further then please feel free to post.
Best Regards!!
Have a good day 🙂 .