More of Don's
Horsethief Lake State Park
Renamed "Columbia Hills State Park" in 2003
They renamed Horsethief Lake State Park Columbia Hills State Park in 2003 but some of the signs still say Horsethief. I prefer Horsethief, myself. Actually, the lake in Horsethief isn't really a lake, but an impoundment of the Columbia River behind a railroad causeway. And I didn't see any horsethieves, but then I guess you wouldn't.
The main attraction here is a display of petroglyphs rescued from the lower cliffs when The Dalles dam was built. The display is easy to access and quite extensive; I'm only showing you two samples here.
There is a guided tour which goes along a trail, which might be very interesting. Reservations are needed for that.