People tend to check in during these times:
A beautiful area to see frogs.
Duck, duck, goose... birds and frogs can be seen around this lush and verdant area.
photo tip: great place to take pictures of the changes in season. Also, walk farther down and you'll end up by Lake Washington which is another great photo subject
You want ducks? They got ducks
If course it's awesome on a hot summer day but it's calm and peaceful when it's overcast too
Hit up the observation deck.