What other San Francisco neighborhoods are similar to Marina?

Depends on the similarities you're looking for of course, but the neighborhoods which have the most similarities are Cow Hollow, Pacific Heights, Polk Street area (Russian & Nob Hill), and Noe Valley. All affluent, more family-oriented, and some of the most sought after real estate in San Francisco!

If you like the Marina for Chestnut St and all it has to offer you'll like Polk St in Russian Hill, Fillmore St in Lower Pac Heights, 24th St in Noe Valley, and Union St in Cow Hollow. All 4 of these have similar climates, and similar housing stock and people. Noe Valley is probably the warmest/sunniest of the 4 and offers the best south bay commute, and is a bit more family oriented. Cow Hollow is a sister neighborhood to the Marina so it is the most similar. Russian Hill is also nearby but per its name is very hilly. But for access to the water, parks, shopping and not having to deal with hills, nothing compares to the Marina