Impact and splat action are still popular, action acres about 10 minutes from splat action does some scenario games here and there.
Impact in Tualatin is the place to go for speedball (SUP type bunker fields), I prefer splat for woodsball days with the pump.
Show up to either of those 2 on a Saturday or Sunday and there are plenty of walk on games, and the folks are for the most part just as welcoming as 05-11 days.
Impact does some Thursdays too, check their facebook for dates.
"Chuck Norris talks in the fourth person"