My new neighbors.  

Well, if their car is blocking your driveway and they won't move it, the only other recourse I can think of is to call the police and/or a towing service. The police department might have someone employed who speaks Spanish, especially if it's a commonly spoken language in your area.
Aside from that, though, maybe just give things some time to settle down. Fixing up a house takes a lot of time and work. You're likely to hear some noise for a while, and there's not much to be done about it. It's likely that someone just forgot to turn the hose off because they're busy and tired- I doubt they did it just to irritate you. As for the party, maybe they were just having a party to celebrate their new house. If it becomes a recurring problem, then you might want to involve the authorities, but for now I'd say the best way to be a good neighbor is to give your new neighbors a chance.

I think your neighbor really is a little inconsiderate but give them time to adapt. It's hard to quickly adapt into a new environment/community specially when language barrier exists. If you still find them troublesome after some time you may now ask the help of the local authorities but for now try to be patient and a good neighbor.

Wow, some people have a lot of nerve! They used your water and hose to wash their windows and house? First, that is rude. Second, it borders on stealing. If they don't mind going into your yard and using your stuff, then what else will they end up "borrowing"? Third, if you have municipal water, then you have to pay for all the water they used without asking. If you have a well, then not only do you have to pay for the electricity that they used letting the pump run all that time but also they run the risk of burning out your pump. So, actually it is stealing.

Alright, I think I am getting as angry about this situation as you are! I would try talking to them. If they insist that they don't speak English, then you might need to bring the cops into the equation. That might seem extreme, but it sounds like it could easily escalate into a major situation, so that might be your best bet. It might scare them enough to behave. If it doesn't, then at least your local law enforcement will have a record of the incident, which will help your case if there is trouble in the future.