Olallie Lake aera is one of the more loved places in Northern Oregon. That bumpy, dusty road at times will have as many cars as I-5 sans big trucks. If you can go in the middle of the week it's a great place.
To avoid the crowds camp at Lower Lake, day trip to Olallie Lake. Make the 1/2 mile hike to Lower Lake and for a dip. If you're a bit more adventuresome, hike to one of the other 30 lakes in the area. A number of years ago we took our 3 youngest girls and sampled the swimming in 3 of the backcountry lakes. They deemed Cigar Lake as the best for swimming. No swimming in Olallie Lake, but the lake right across the road is pretty good swimming hole.
With a high clearance vehicle you can also drive up and over to Breitenbush Lake. There's a short (10' - 20') climb up on some rocks for a great view along the way.
Glad you enjoyed the area. As you can tell it's been on of our favorites. My first trip up there was about 40 years ago.
Byron & Anne enjoying the everyday Saturday thing.