Not-depressing Science Fiction

I am in search of more sf that is excited about the future instead of depressing and "we suck, the future is going to suck." Here are some titles that inspire or at least don't depress me - what about you?
  1. Chindi by Jack McDevitt
  2. Have Spacesuit Will Travel by Robert Heinlein
  3. Ringworld by Larry Niven
  4. The Martian by Andy Weir
  5. The Stainless Steel Rat is Born by Harry Harrison
  6. Hitchhiker's Guide to the Galaxy by Douglas Adams
  7. Little Brother by Cory Doctorow
  8. A Deepness in the Sky by Vernor Vinge
  9. Snow Crash by Neal Stephenson