Any tips for driving around Seattle?

Hi everyone, I am from Mexico and I am planning a little travel with my girlfriend (soon to be fiancée), I want to take her to Forks and Port Angeles. (she is a twilight fan and has always wanted to go there, I know there is really not much to do and that it might be disappointing if we expect too much, we are aware that the most interesting things to do there is enjoy the nature and that’s exactly why we wanna go)

My plan is to go there in April, arrive on a Friday, stay the night in Seattle, rent a car and drive all the way to Port Angeles, we will stay there for 3 nights, go back to Seattle the day before our flight back home, stay another night in Seattle and leave in the morning.

My main concern is all the driving, I have been driving since I am 17 years old and now I am 26 so I think I have good driving skills, I have done 5+ hr drives on highways so I was wondering if you guys have any tips for me. Are there any toll charges that I need to be aware of? Idk, if you guys have any advice for me regarding the driving I will have to do I would appreciate it, I have never driven a car in a different country so I am kinda nervous.