Take the 215 to the 210 East Hwy to the 330 towards Big Bear. Hwy 330 turn's into Hwy 18 just outside of Running Springs. When you reach the Dam, turn left and follow the signs to Fawnskin.. Pass through Fawnskin, and turn right on North Shore Lane. Signs for the Solar Observatory will be at this intersection. The resort is just ahead on the right. Look for the Waterfall and the Gated Entryway.

From Redlands:

Take Lugonia, which turns into Hwy 38. Follow Hwy 38 all the way into Big Bear City. Turn left onto Big Bear Blvd.. Stay on Big Bear Blvd until you reach Stanfield Cutoff. Turn right on Stanfield and cross over the bridge. Turn left onto North Shore Blvd . Stay on North Shore and pass the Discovery Center. Just past the Discovery Center, North Shore Lane will be on your left.  Turn left on North Shore Lane. On the left will be the gated entry with the waterfall. 

From Apple Valley & Lucerne Area: 

From Apple/Lucerne Valley, go south on Hwy 18. Once arriving in Big Bear,  Hwy 18 turns into North Shore Road. Stay on North Shore Road, past the Discovery Center. Just past the Discovery Center,  North Shore Lane will be on your left. Turn left on North Shore Lane. On the left will be the gated entry with the waterfall.