I'd ask in the Miami forum for where to be picked up, or if it's even legal in Miami for Uber to pick you up. I think the app or Uber website can also help. Happy to move this thread there if you'd like, to avoid cross posting.

You're not required to tip Uber drivers, and there is active debate as to whether you should. Uber takes I think 20-30% of the fare as its commission. I generally don't tip unless the driver goes out of his/her way to accommodate some odd request or otherwise do something above and beyond.