Paulina Lake campground is just south of Bend on US97.
It is an old volcanic caldera that has filled up with water, and has a lot of campsites for both RVs and tent campers.
$5 a night for a site. On the other side of the lake from the campground they have boat rentals and there are fish in that lake. There is a hot spring on the east side of the lake where hot water comes up through the sand.
Bear signs everywhere, but I have never seen a bear. My pup growls in the middle of the night when we are tent camping, and those three tritium dots are pretty nice to look at.
Plenty of fallen wood up in the treeline for campfires.
Lot's of hiking trails too. I took off with my pup, and we went about half a mile up a trailhead and a sign said 'no dogs past this point'. Naturally, we kept going, and the trail turned into crushed obsidian! Sharp as broken glass razors! We got back out of there unhurt.
It's dry high desert, so carry water even on a short hike.