You can also canoe across if you're in a race to beat the other guy! LoLWe went to Timothy Lake and it was great. If you go to the end of the dam and turn right and park, you can walk to campsights all along the lake shore. It is first come first serve so if you go on a Monday it is a lot easier to find something. You can walk in 100 yards to 3-4 miles I think. There are toilets every 3 or 4 campgrounds and that is it.
Highly recommended.
Timothy Lake, Oregon - Camping, Swimming, Fishing & More
45°06'55.9"N 121°48'21.3"W
That place is crowded.
All you need is a good map. You can set up almost anywhere, so it will say "no overnight camping" if you can't. State Parks and National Parks are your best bet for "woodsie" while BLM will be your best high desert. Stay on the trails and you'll be fine.