I'm learning a lot every second I'm here. A few things I picked up on really quickly; can't be closterphobic, don't step in puddles (especially in flip flops or sandals) , jaywalking is ok in groups, dont commit to a straight line, there is NO personal space, and my legs won't stop burning.
Never stop carrying your umbrella! I've had mine all day but I decided to drop the big bag at the room and travel light. Wouldn't you know it, I get 2 blocks from my destination and BAM rain.