There's an interactive map of the length of Grizzly Peak Boulevard below the clickable maps, and a photo from Spruce at Grizzly Peak at the bottom of the page gives you an idea of the panorama. The best viewpoints are from sections north of Southpark Drive, between Lomas Contadas and Claremont, and south of Marlborough Terrace.
from North Berkeley BART
from Downtown Berkeley BART
from Ashby BART
from Rockridge BART
from Orinda BART
El Cerrito Plaza (Spruce the direct way) is a nice route to do a run down Grizzly Peak and Skyline from the north. Spruce is usually first choice from any Berkeley station, Downtown Berkeley offers the shortest climb. Orinda offers the steepest (El Toyonal/Lomas Cantadas) route, Downtown Berkeley (Centennial) 2nd steepest.
Grizzly Peak has water at intersection with Spruce (NW corner), Lomas Cantadas (steam train parking lot), and Skyline (Sibley parking lot). The last two have bathrooms too.
Please submit suggestions for better routing or added route options through comments