Hello,

You are interested in …/…-filters/v2/list (ex : …/attraction-filters/v2/list) endpoints which are used to generate the filter panels dynamically in different listing pages.

Regards.

Here is an example for categories in TA activity:

https://www.tripadvisor.com/Attraction_Review-g190454-d194165-Reviews-Schonbrunn_Palace-Vienna.html

#2 of 920 things to do in Vienna Architectural Buildings • Castles

Its can also be found in the attarctions/list endpoint results
in a result item is under 3 properties there:
category, subcategory, subtype

category: {key:"attraction"name:“Attraction”},
subcategory:[{key:“49”,name:“Museums”}],
subtype:[{key:“32”,name:“Military Museums”}]

Hello,

Can you achieve that somewhere on tripadvisor.com? I will then point out the suitable endpoint for you.

Regards.