I've stayed at 2 parks at Osoyoos. At the south end of the lake, on the Washington side is a park with open grassy sites. It used to be a state park, but I think it's been transfered to the county or town.
Haynes Pt Prov. Park is on a long narrow peninsula. Because all sites are close to the water it's quite popular.
Population and activity jumps noticeably when you cross the border. This is a relatively remote part of Washington, but a popular vacation area for BC. Osoyoos is of the driest and hottest parts of Canada. Plus orchards and wineries.
