I forgot to include these five other doubts.

1) What did you like the most (doing) during your holidays?
2) What did you like the most OF your holidays?
3) I didn't go sightseeing in Paris because it was my third time there
is it also possible "because I had been there for the third time".
4) How did you like Paris? OR What was Paris like?
It was fun OR I had fun in Paris (are they both correct?)
5) What was your journey TO Paris like?

Thank you very much for your help.

1 is OK -- delete the word in parentheses.

2 "about" not "of"

3 period at the end; forget the words in quotation marks

4 all are correct

5. is OK

1) To answer the question "What did you like the most (doing) during your holidays?", you can reflect on the activities or experiences you enjoyed the most during your vacation. Consider what gave you the most satisfaction, pleasure, or enjoyment. It could be something specific like swimming, hiking, or exploring a new city.

2) To answer the question "What did you like the most OF your holidays?", you can think about the overall highlights or aspects of your vacation that stood out to you. It doesn't have to be limited to specific activities, but rather anything that made your holiday memorable. It could be the people you met, the food you tried, the scenery, or the cultural experiences.

3) The sentence "I didn't go sightseeing in Paris because it was my third time there" implies that you didn't go sightseeing in Paris because you had been there two times before. This sentence suggests that you wanted to do something different instead of repeating the same activity. However, the alternative sentence "because I had been there for the third time" could also be used to express the same idea.

4) Both "How did you like Paris?" and "What was Paris like?" are correct ways to inquire about your experience in Paris. However, the responses "It was fun" or "I had fun in Paris" are not the typical responses to these questions. "How did you like Paris?" usually invites a more detailed response, allowing you to express your opinions and impressions of the city. "What was Paris like?" is a more general question that asks for a description or overall depiction of your experience, rather than just your enjoyment.

5) To answer the question "What was your journey TO Paris like?", you can provide a description or account of your travel experience. This could include details such as the mode of transportation, the duration of the journey, any interesting sights you encountered along the way, any challenges or highlights, and your overall impression of the journey.