Elephant Bar is a great (and expensive) alternative to Denny's and IHOP. In fact, the place itself is pretty much the end result if Denny's were to be charged into by an angry herd of rhinos. The place has fake giraffes and other exotic wild animals strewn about the place, putting it amongst of the few theme restaurants in the Bay.
Their menu also seems to have been developed in a similar fashion. It's pretty much anything you could probably find at Denny's except loaded with exotic twsists like the addition of fish and different styled sauces to many popular dishes. They also feature classic staples such as baby back ribs and alocoholic beverages.
The only downside the place really are the prices, which I believe we're 1.5x whatever Denny's or IHOP would typically charge.
If you like tasty food and you're tired of Denny's, give Elephant Bar a try. But if you're strapped for cash and afraid of ceramic zebras, I'd reccoment a place like Baldie's Cafe in Union City instead.