次の休みにいく旅行の計画を立てていますって英語でなんて言うの？

It is important to note that in various parts of the world there are different terms relating to taking time off of work and enjoying recreational activities. Some parts of the world refer to it as 'on vacation,' while other parts of the world refer to it as 'going on holiday.' It is common to use the word 'trip' when traveling anywhere. It is essential to plan your itinerary for a trip since this includes booking flights and accommodation as well as the activities one would like to be involved in when reaching your destination. To set this up means that you have made arrangements for all these things to be booked and paid for as needed.

If someone asks "How have you been spending your free time recently?" they're asking about activities outside of work, school, or your normal routine. Therefore, "I've been planning a trip" or either of the other answers would be fine. Whether you include "this winter" or the "booking tickets" details depends on the amount of information you feel the person needs. And unless the planning is taking all of your free time, you can leave out the "I've been busy..." part.

I will be busy planning my trip for this winter. This phrase speaks about someone who is going to be planning a trip in winter. The person has not started planning yet but they WILL be planning a trip for the winter.

When you plan a trip there are alot of things to do like booking transport hotels insurance etc to get all this ready is called 'preparing' or 'organising by saying 'this winter' this tells the person when you are going

Often the reply you'd go into somewhat detailed explanation depending on who is asking the question, friend, relative or just an acquaintance. for a friend or relative its important to list the activities and how you've been spending your time (outside of the normal school, work ect..)

If you are going to go on a vacation soon, it is absolutely necessary to get very busy making preparations for this very important event in which you spend time away from work either with your family, friends or even alone. Getting organized is very important, taking everything into consideration because a vacation can be a nightmare if not well planned. You have to carefully consider where you will go and adequately budget for the trip. All the foregoing can keep you very busy. So, you may say: I have been busy organizing my next vacation. or I have been busy considering how to spend my upcoming vacation. or I have been busy planning where to go during my upcoming vacation.

You could say that you have been doing research and checking reviews to find a decent hotel for your next holiday. You could continue the conversation by asking: Have you been there before? Can you recommend any hotels or things to do? Travel is a topic that everyone likes to talk about.