We will travel to Frenchman Coulee (Vantage WA) on Friday night after work, climb Saturday, climb Sunday, climb half of Monday and then return. Vantage has a good selection of easy, moderate to hard sport climbs from 5.4 and goes up to 5.12
Frenchman's Coulee is where most of the climbing is.
Here is an online guide to some of the climbs: http://www.justgetout.net/ClientFiles/8ecf9e69-8f8f-419d-91d8-10c7ca9cbcbb/VantageGuide-AllEdited-515.pdf

Accommodation: You may choose to stay in Vantage, camp at Frenchman's coulee or paid camp (more comfortably) at Rocky Coulee campground: http://www.grantpud.org/recreation/campgrounds/rocky-coulee-campground
We'll reconvene each morning at a convenient location depending on where everyone stays. I've heard the wind can be very strong, so anticipate needing a strong tent, car camping, or possibly even booking a motel.

Every vehicle will need a Washington State Parks discovery pass. They are $10/day or $30/year and you can either buy them and print them online before leaving, or buy them from some REI's / the Vantage general once you're in the US (assuming you arrive before they close): http://www.discoverpass.wa.gov/133/Where-to-Buy

Food/Water:
The Vantage General store often closes whenever they feel like it, especially on a weekend, so don't expect it to be open Friday night. There is no running water at the crag, or the Rocky Coulee campsite - so make sure you bring/buy some.

Border:
You MUST have a valid passport or other travel document enabling you to cross the US border. STRONGLY CONSIDER insurance for the trip. Arrange your ESTA visa in advance to save time at the border: http://www.esta.us/
Do NOT use the nexus lane unless everyone has a nexus card. Don't take fruit/vegetables across the border, it's not worth the hassle/risk - you can buy vegetables in the US easily, and no doubt you will enjoy the additional selection of food not available in Canada anyway.

Equipment:
Helmet, climbing harness, rope, belay device, quickdraws, rope tarp (optional - ground can get dusty), water, headlamp, ten essentials, trad gear unnecessary. Water. Toilet paper - there is none at the longdrop at the crag. Did I say water - there's no water at the crag.