In Seatle, the weather can be pretty cold and rain is typical.  Are you able to enjoy running in the rainy environment also?
I like running in hot rain, when the water is warm because it's like I'm taking a shower but naturally. It's like vegan rain.
I would think that running is not as popular in Seattle, due to rain.  Is it easy to find like-minded runners like you?  
Not many people enjoy running in hot rain like me so I mostly post about my hot-rain-running thoughts on Reddit. There are other people that enjoy it too there on the internet.
Are there any particular type of terrain that you like run on?  I know that running downhill has an extremely nice and cool air feel, but going up the hill is a pain.
I like running on concrete because when it's safer for insects and other animals that live in dirt and grass. I don't want to hurt anyone while I follow my passions.
Other than running, do you find other physical activities appealing?  There is a Seattle Yacht Club that does many events.  Sailing can give a nice cool air feel as well.
I'm actually scared of sailing because I don't wanna be implicated or trapped in the middle of the sea and have to swim back to shore. I will get tired and or lost
Yes that is a very valid concern.  In addition with the rainy weather, it can be a tough hobby to pick up. Are there any locations that you particularly enjoy running?
I love running on the natural treadmill that i called Earth.