There's parking next to the reception, but you will need to do some exercise and walk to the ceremony (think about all the good food that you gonna eat later, it's worth it)
If your invitation says “and Guest,” then yes, if not, we would prefer if it was just you.
Cocktail, please. But we want you to feel comfortable, so if those shoes are too high or that top button is too tight, let it all hang loose.