もしよかったら案内しましょうか？って英語でなんて言うの？

To my ears, "I can show you" is the most natural way to express this idea. I think it would be a good idea to ask permission to accompany the person by saying something like "If you like" or "If you want."

Any of these phrases will suffice.

"show you" or "show you the way" means that you will guide that person, or take them there You can say enthusiastically, "C'mon! I'll show you the way!" If you're going in that direction anyways, you can say, "I'm headed in that direction anyways, so I'll just take you there." Or you can request their permission to take them there by saying, "If you want, I can just show you."

"I can do you one good. I can take you there." This means that let me make your day by taking you there. "Make your day" means to make someone happy.

*If you're lost, I can take you there?* MEANING= you have asked for directions therefore you must/or might be lost. 'I can take you there' means I can guide you there either by walking or by car- it isn't clear by this statement which one it is. *If you like, I could give you a lift there?* MEANING= I could give you a lift there- means I can take you there in my car or on my motorcycle. *You want to get to the _____? Ah that's no problem I can take you there myself! * MEANING= in the space you could put where they are trying to get to. For example: you want to get to the library?--- Then 'I can take you there' is similar to 'I can give you a lift' You might also want to add, 'its no problem' after any of these phrases, then the other person doesn't feel like they're getting you to go out of your way to help them.

"I can show you" Is an expression, this states you can 'show'/guide/take them to a destination or to teach them something. "Would you like me to take you there" A polite offer that asks 'would you like', a kind a polite gesture used, to show/take or guide someone to a destination.

In the first offer, you are sounding very compelling by using the phrasal verb 'let me' which means 'to make an offer for help'. So you may say: 'Let me' physically take you there. You have used the adverb 'physically' to mean 'bodily and not mentally'. In the second offer, you have used the expression 'if you don't mind' before the offer, 'I can take you there'. The expression 'if you don't mind' softens the offer which would otherwise have sounded like a command.

If you were to translate this literally, もしよかったら案内しましょうか would sound like "if this is okay with you, I can show you the way." That is a bit formal to say. "I can show you the way if you'd like," or "do you want me to show you the way?" has most natural nuance. "If you'd like, I can take you there" is also more casual, and closest to the translation.

Saying this would be a polite way of asking to take them there.

If you are giving someone directions and you want to offer to just take them there we would say "I can take you there". That's the easiest way but the person might decline. "I know the way! Follow me" is a way for them to not be able to decline you. "I was heading that way anyway" is a good way to make the person know that you aren't inconveniencing them.

It is very kind to help those around you. When you would like to offer someone a ride to a place they are searching for, use any of the above sentences. The first two sentences pose a question of whether or not the person would like to take a ride from you, the last sentence is more of a statement although there is still room for the offer to be denied.

both of these sentences will extend a offer to the person that you are talking to to take them to the place you are describing