The Skagit Valley Tulip Festival is coming up in a couple of weeks. Check out their website at www.tulipfestival.org for information.
It's an easy drive from Vancouver and once you get there, you'll be rewarded with endless vistas of colorful tulips in many different varieties. After taking in the tulips, on your way back home you can either have dinner at Tulalip Casino (farther south on I-5) or at Silver Reef Casino just south of Bellingham. By the way, if you're into shopping, there's a factory outlet mall next to Tulalip Casino.