For travelers coming to the Portland area, there really isn't much to do in Oak Grove, compared to the many other interesting things in the Portland area. Therefore, I have put everything worthwhile in the "off the beaten path" tips.
The reason for this is quite simple: you can do better elsewhere. Don't come to Oak Grove unless you have to. You can do better elsewhere.
However, if you do have to come here, you might be interested in a few of the things this area offers to its local residents.
There are many Christmas light shows in the Portland area that are far more famous than those of little Anspach Street in Oak Grove. However, despite their not being particularly famous in the region, the lighting shows in recent years have been good.
I would not recommend a trip specifically to Oak Grove to see the lights, but if you are coming through the area on highway 99E it doesn't take much to swing over here to see what is going on.
From the intersection of Oak Grove Blvd. and River Road head south down the hill. Near (but before!!!) the bottom of the hill, turn left onto Anspach. DIM YOUR HEADLIGHTS so that other people can see.
Or, park on a nearby street and walk.
This park is one of the few publicly accessible spots along the Willamette River in the Oak Grove area. Most of the other areas along the river are privately owned homes.
The park has restrooms that are closed during most of the year.
It is located right next to, and under, the ex-Southern Pacific (now operated by Willamette & Pacific) bridge between Milwaukie and Lake Oswego.
There is a picnic area, and some very rough trails along the river. There is a paved trail that goes from the parking lot to the edge of the water.
It is a good picnic area should you want to find some sort of scenic picnic spot in the jungle of what has become Oak Grove.
It is maintained by the North Clackamas Parks & Recreation District (web site below) and the address is 925 SE Courtney Road. From River Road follow signs west to the river and the park.