Tam-a-lau seems like a bucket list hike, at least in terms of those in Central Oregon. It's not…read moreterribly difficult but is well worth the effort nonetheless.
The trail runs from near lake level in Cove Palisades State Park to the top of the 'Peninsula', as it's called. The Peninsula is that bit of land jutting north into Lake Billy Chinook between the Deschutes and Crooked Rivers (minus The Island, which is a whole 'nother experience if you are fortunate enough to get a chance to go there). Tam-a-lau Trail is about seven miles in length, which comprises 1.7 miles hiking from the trailhead parking lot and then ascending the steep canyon wall, about 3.6 miles of relatively flat hiking on top of the Peninsula, and then 1.7 down.
The trailhead is two locations, really. One starts at the big parking lot just past the boat launch on the Deschutes River and has you walk a bit to the other trailhead. That one is at the Deschutes Campground and is the beginning of your ascent up the slope. Unless you're staying in the campground, I recommend the further trailhead - the half mile or so extra is a nice trail.
Footing is OK throughout, although the ascent has some steep bits that you'll want to be careful with. Once you're at the top, it's a piece of cake. The top reminds me of the Oregon Badlands, except for the really nice lake views.
Once you get to the top, you'll be at a junction. Left takes you to the tip of the peninsula by way of the Deschutes River side, while right takes you overland to the Crooked River side and thence to the tip. Either way, your goal is the peninsula tip. Some folks seem to think the overland section is boring but not me. If for some reason you want a shorter hike, go left and then backtrack the way you came.
Tam-a-lau is about views of Lake Billy Chinook, the canyon lava walls and, if the weather is good, the distant views of the Cascades. It's also a good bit of exercise. During the summer, it will be hot. There's not a lot of shade - this isn't a ponderosa forest hike. Take plenty of water.
Being in a state park, you'll either need an annual/biannual pass or pay $5 to park.
Note that you can access the upper part of the Tam-a-lau (the flat part on the Peninsula) from roads to the south. You don't have to enter the state park from that way. In fact, much of the Tam-a-lau is not actually within the state park boundaries but rather on BLM land.