Just the driving distances involved in getting to each destination would keep you from visiting all of the places within Olympic National Park in one day. I completely agree with the suggestion that if you only have one day, go to Hurricane Ridge. Beautiful hiking, incredible views. In two days, we visited three locations - Hurricane Ridge, the Hoh Rain Forest, and Ruby Beach. Each was phenomenal, in very different ways. We could easily have spent much more time fully exploring all of these places. I would suggest that you read the "places to go" section of Olympic's website, see what appeals to you the most, go there first, and take it from there.

The ONP visitors center is under major renovations until summer of 2018. It will be open in prefab conditions tho. Restrooms etc.suggest taking a lunch to The Ridge ,driving past lodge and where the restrooms are take a short walk to picnic tables and a fabulous view to Mt. Olympus. Hope you have a great trip and stay safe.

There's a small shopping center Forks Outfitters on the south side of Forks that might let you stay there. There's also an RV park the Forks 101 RV Park which is across 101 from the outfitters on a side street.

The way you find the Huricane Ridge Visitors Center ti to take Race Street from the 101 (Left if coming from the east, right if coming from the west). Go about 15 blocks up tp E. Park. Go through that intersection and look for signs on your right for the Ranger Station. You will see it as you bear right and start up the hill. Iff you are over 62 remember to buy your LIFETIME pass for $10. Good for a car load. :0)

We visited the park last month and stayed at the Quillayute River Resort in Forks for the coastal and rain forest areas of the park. The resort was wonderful. It was a great stay for us to do exploring in that area. They have a kitchenette so we picked up breakfast and lunch foods and brought lunch with us when we headed out for the day. Restaurants in the areas of the rain forests are far and few between, but by evening when we would return, restaurants in Forks were quite good. When we visited the remainder of the park, we stayed in Port Angeles at the Olympic Lodge which was also very nice and centrally located for sightseeing and restaurants. Enjoy your visit, it's a wonderful park to see!

So far you have received some great suggestions. I would offer two recommendations for what they are worth. Take the ferry from Port Angeles to Victoria for an overnight stay. This will be a highlight of your trip. The other suggestion is to visit the Ho Rain Forest on the west coast and stay overnight at the Kalaloch Lodge. On your way there, stop at Rialto Beach and La Push. At that point, return to Seattle via Aberdeen and Tacoma.

Sort of---items that pertain to the park--books and a few toys

Not sure about discounts but if you have a National Parks pass you get in to all National Parks without having to pay the entrance fee

Your Golden Age Pass (which may no longer be available) is good in all National Parks.