With the Three Sisters Wilderness [1] and the Deschutes National Forest [2] flanking Bend [3], there are many wonderful spots to enjoy camping out under the stars.
But for those who want to stay closer to civilization, Tumalo State Park (64120 O.B. Riley Rd., 541/382-3586 or 800/551-6949, www.oregonstateparks.org [4], year-round, $21 tents, $26 hookups, $39 yurts) is convenient and not overly urbanized. Located five miles northwest of Bend off of U.S. 20 along the banks of the Deschutes River, 54 tent sites, 23 sites for RVs up to 35 feet long, and showers are available.
A couple of decent RV parks can be found near Bend. Crown Villa (60801 Brosterhous Rd., 541/388-1131 or 866/500-5300, $50–70) is exceptionally well maintained and has lots of amenities.
Links:
[1] http://www.fs.fed.us/r6/willamette/recreation/tripplanning/wilderness/threesisters.html
[2] http://www.fs.fed.us/r6/centraloregon
[3] http://www.moon.com/destinations/oregon/central-oregon/bend
[4] http://www.oregonstateparks.org