Vancouver
Vancouver, Washington sits directly across the Columbia River from Portland. Although Vancouver is a bustling town, it also has the advantage of being centrally located to wonderful outdoor activities. Vancouver has a lot to offer the out-of-towner, and is worth a day trip. If you're in this area, pick up the Vancouver Walkaround Guide, which can be found online or free in downtown Vancouver, to find some of the best hikes in the area for both in the city and in the surrounding area.