I appreciate:

• Weather warm enough to go for a walk!
• Rainboots, because they a) are easy to put on without any of that painful toe-bending stuff required by other shoes b) allow me to walk through puddles (puddles!) and still retain my dry-foot status c) are purdy.
•  Hearing! So many wonderful spring-y-licious sounds: birds, puddle splashes (splooshes), people talking, airplanes. So so so so good.