Challenge objects for spring/ summer skies

I'm planning a trip to unusually, for me, dark skies. So I'm asking for help in constructing a list of objects I won't be able to see after I return home. I'm not interested in searching out stellar-size planetary nebulae (although I will hunt for 3C-273 because that point of light has a good story). I'm hoping for compact objects as faint as m13 that might show some detail or more extended/ low surface brightness objects as faint as m11 or m12.

An example: a couple of years ago (the last time I went to really dark skies) I was blown away by NGC833/ 835/ 838/ 839. I stared. I sketched. I returned the next night for another look.

What objects have stayed in your memory long after you returned to your local light dome?

Oops, I forgot to tell you where in the sky I'll be looking. Throughout the night, I'll be able to view from eastern Gemini to western Pegasus and as far south as -45 degrees (perhaps -50 degrees).