When you arrive at the small parking lot at the beginning of the Rock Creek Park DGC, you have idea as to what kind of an adventure you have to look forward to. And what I call an adventure some players would proclaim it to be a wonderful experience while others might not feel quite so enthusiastic about Rock Creek.
Start at the parking lot, there's a metal kiosk with all kind of disc golf information. There's a great concrete tee pad and small colored signs supplying you with the hole information.
I attempted to play Rock Canyon alone and in the midday heat of a 100 degree July day. I don't believe either of these choices were the best. And I doubt if either enhanced my love for this canyon course much.
Looking down at # 1 and seeing it listed as somewhere between 360 to 400' down a steep hillside, with no visible basket and nothing but trouble lurking on all sides, I opted to wisely pass on probably the most memorable hole on the course.
The canyon, even in mid-summer, is absolutely beautiful with it's steep cliffs on one side and the river on the other.
Quite a few holes offer blind basket placement and numerous chances to never see your disc again.
There are so many unique and challenging holes here that I can totally understand those players rating it high. On the other hand, there are just as many holes with major issues including safety, losing discs or in the case of # 10, a semi-perilous looking climb in your disc lands up high on the rock face.

Safety issue on holes where you're throwing into the on-coming path (# 3 ) is one. You really have to be willing to wait for the pedestrians to pass be throwing.
Blind baskets make it really difficult for the first time player here.
River will surely eat many a disc.
The last two holes, you're throwing straight up the hill.
I was having a bit of a difficult time navigating before joining up with a gentlemen and his two teens playing on # 10.

Who designed this course of horror? I'd like to shake his hand and off my compliments to the chef or whatever. This course is both unique in it's design and difficulty and totally scary and horrific 18 at the same time. It's definitely a man's course from start to finish.

If you can survive Rock Creek Park, I venture to say you're ready to take on any of almost 700 courses I've played. I would just recommend that you don't try playing it for the first time at 3 PM in 100 degree heat by yourself. Probably tempers your experience just a little.