目的地と反対方向にも関わらず最後まで案内してくれたって英語でなんて言うの？

*I met a really helpful local. He escorted me to where I was going and it was the opposite direction to where he was going. To escort means accompany or take someone somewhere. In this case the local did you a favor by making sure you get to the place you wanted to go.

"led me" or "escorted me" - both of these things mean that he took you to the place you were going because he knew the way there... an "escort" at a movie theater, event, etc. is someone who seats you (by either taking you to or leading you in the direction of your proper seat) the direction I was headed in - you head leads your body, so to be headed somewhere is to be directed somewhere, or to be on your way somewhere and in some direction

If someone makes a U-turn it means that they change direction by a hundred and eighty degrees. For example, turning around in a road and going back in the opposite direction - in one manoeuvre, is U-turn. To go out of one's way = to try very hard to do something, especially for someone else: "They really went out of their way to make us feel welcome."

"A very nice person helped me find my way even though my destination was in the opposite direction of his." This explains that the person helped you to find your way even though they were going in a different direction. "A local person helped me find my way even though it was in the opposite way to which he was going." This is another way of explaining that they helped you even though they were going in a different direction.

It is not usual that a person who is not a tourist guide will go out of his way and guide you right up to your destination even though his/her destination is in the opposite direction. In this regard, such a person can be described as being 'generous'. The adjective 'generous' used in the first statement has several meanings, but, in this context, it means 'showing kindness toward other people'. That person was 'extremely helpful' to 'accompany' you to your destination even though his destination was on the other side. The verb to 'accompany' means to go somewhere with someone as an 'escort' in this case. So, you may say to someone: When I went abroad, a generous local person guided me to my destination which was in the opposite direction of where he himself was going or When I went abroad, a very helpful local person accompanied me right up to my destination which was in the opposite direction of where he himself was going

If someone escorts you then they help and show you the way to somewhere and make sure you get there safely If they were going a different way then you can say 'they were not going that way themself' or 'were going in the opposite direction'

"A local helped me find my destination even tho it was out of his way" This statement is referring that someone had helped you find somewhere you wanted to go to and the person helping was not going in that direction and was not convenient for them. A 'local' is the term used to describe someone who is from an area that they live. When using 'destination' this is describing a location you are heading too. 'Out of his way' is an expression used when referring that something is an inconvenience for someone, that they have to do something requiring more effort that thought.