pretty wide open question..  What types of farming do you want to see ??

For shear crop diversity the Columbia Basin is your best bet. Draw a circle at 80 miles around Moses Lake and you will have seen alot of different crops.

For true "dry land" farming, the area around the Palouse will give you some idea of what HILLS and dry land is. There's also a smaller area "sorta like the Palouse around the Mansfield area and South around Hi 2 . June would put you pretty close to combine time, and you'd get a chance to see what hillside combines operate on.

Pretty intensive veggies type cropping systems in the Yakima Valley area. Large "truck garden" type crops. (personally I've never understood that goofy saying,, always reminds me of a bunch of Petes, or K.W.'s  poking up out of the ground.

The Skagit Valley North of Seattle is probably alot closer to what P.A. is like. Rains ALOT more west of the Cascade Ridge.

June is starting Haying here in the Kittitas valley. Couple of bigger farmers here. If you've never seen 30-50 acres of 4 ton windrows disappear through 5-6 balers, and be hauled off by 2-3 balewagons in 4-5 hours before it's kind of amazing how fast alot of tons of hay can "disappear" PDQ.