"quite a climb"???
That little hill is a heart-breaker. It used to be called "Old Forty-Five" (although it is actually more like 20°), but now it has degenerated into "The Dune Climb". Because that face (over the parking lot) is the down-wind side of the dune it is actually at a steeper pitch than the natural "angle of repose" for sand. Any disturbance (like a foot) and the sand wants to slide down-hill, taking the foot with it. You lose about 2/3 of every step you take while climbing, effectively making the effort required three times as much as its actual height of around 260 feet would take if it were a firm surface. (The rest of the dune massif
is even bigger and higher. It's a mile and a half to the lake across five more giant dunes. I made that 3-hour trek once as a youth, and again at about age 45. I doubt I'll ever do it again.)
The picture looks to be somewhere between the first crest and the second crest, so it is probably about 200-220' above the parking lot.
Good article HERE.
But the view is good. Glen Lake is often included in 10-Prettiest-Lakes-in-the-World lists. The dune itself is considered Michigan's most famous natural feature. I would definitely call that "with famous landmark background".