http://www.countyofsb.org/parks/parks05.aspx?id=14112The map should help. The best lake views are on west side Dakota section-no hookup. Check out Barona Shores and Barona Butte area if no hookup is OK.
Portions of Barona section is more typical full hookup RV park, some of the sites on the far west side may have views, not certain if you can see lake from RV. There are some water and electric sites in Apache area but I don't think they are directly adjacent to the lake. If you arrive on a weekday you should be able to scout around and come up with something nice.