Help me, SF hounds. Trip to SF next week. I'll be staying in Chinatown, my friends in Japantown. Neither of us will have a vehicle, and we don't know SF that well. We'd like to eat at a moderately-priced restaurant with great seafood in one of those areas or in between (prefer good food to good ambience), and we'd prefer not be killed were we to walk back to our respective hotels post-meal. Thx in advance.