both are possible especially in the English textbooks for beginners

You would never say (1) (2) means you are asking a person (or people) how THEY are going to get somewhere If you want to ask how YOU can get there, normally you would say: 'How do I get there?' This can mean either that you want directions or you want to know which method of transportation to use. Depending on the locality of the place you are asking about, people will know what you mean. If you want to specifically ask which transportation to use, you can say 'What is the best way to travel to (London / New York/ India / Japan/ the beach/ the nearest town...)' to ask another person which transportation they plan to use, we most commonly say: ' How are you getting there?'

I would say that (1) is ambiguous, as it could be interpreted as asking the method of transport, but it could also mean what route would you take. I would therefore use 2.