Hi,
We are in the early stages of planning a road trip in July 2016. Starting in Portland, we're planning to rent a campervan and head to Bend - Crater Lake - Redwoods in Northern Cali - Up the Oregon Coast - Olympic Peninsula - Seattle - Portland. We have two weeks total and will probably spend at least 3 nights in Portland (visiting friends). We have a 2 year old and a 4 year old. A couple of questions at this point (there may be more!)
- Is the Olympic Peninsula / National Park worth the extra time if we've already traveled up the Oregon coast?
- Redwood Nation/State Park a good place to view big trees?
- Any toddler-friendly suggestions along this route are welcome.

There are several places to enjoy the redwoods. One favorite place is Avenue of the Giants in Humboldt Redwoods State Park.

Your friends in Portland will probably tell you that your trip should include the Columbia River Gorge and the waterfalls there.

A lifetime resident of Seattle, Mt. Rainier is the one place I always take visitors and they never fail to be impressed.

HTtY

PS There are members of this forum who do not know that "Cali" is a recognized nickname for California. Don't be offended if one of them, in their ignorance, chides you for using the abbreviation.

I doubt that renting a campervan will save you any money.
I could be wrong. Many Oregon State parks have yurts or cabins which would work for you. http://oregonstateparks.org/?do=reserve.dsp_cabinsyurts
North of Bend we have Tumalo and south we have nice cabins at La Pine State Park.
As you see there are a lot of yurts at parks along the coast.
After seeing all of the Oregon coast, you need to see Mt. Rainier, Mt. Hood and the waterfalls along the Columbia Gorge.
The problem with Olympic NP is that there are no "through" roads.
While in Bend area, stop to see the High Desert Museum and the Newberry Volcanic Monument.
By July, the snow should be gone on the road in from the north entrance to Crater Lake NP. You may see some at roadside in the shady spots.
Check to see if you can reserve a night at the Crater Lake Lodge.
If you can't, try for one of the cabins at the Diamond Lake resort.
Off US 199 headed for the Redwoods, you might want to stop at the Oregon Caves.

Toddler friendly on Oregon coast would be the aquarium in Newport, seeing the sea lions on the dock in Newport ( although sometimes they leave in the summer),playing on the sand dunes south of Florence.

Most kids are happy just playing at the beach. My favorite is Devils Elbow State Park just a bit north of Florence. Nice little cove, there is a trail up to the lighthouse which is open for tours. There is a stream flowing into the ocean that children seem to like playing in.

Camp grounds along the coast fill up quickly so hope that won't be a problem.

Hwy 138 between Crater Lake and Roseburg has many beautiful waterfall stops. Some are a hike, others just a short walk on a paved trail. Kids like playing in the pools at the foot of the falls or the streams. You might bring some water shoes if you do this.

Olympic National Park deserves a minimum of two full days to even scratch the surface. Save that for later when you have more time and the kids are old enough for hiking (because ONP is a hiker's park).