On a side note: The weather in general in Tiburon and Belvedere (and Mill Valley) has MANY micro-climates, depending upon where your house is. It's important to understand this phenomenon that many folks moving to Marin from other parts of the country don't anticipate.
Last summer, all of Southern Marin (Mill Valley, Tiburon, Belvedere and Sausalito) were exceptionally cold and foggy for the most of the summer. Towns just north, (starting at Corte Madera, Larkspur, Greenbrae, San Anselmo , Ross and Kentfield.are MUCH warmer in the summer). The winter weather tends to be similar wherever you live. If you do enjoy warm summer weather, this should be taken into account when you are looking for the best place to end up in Marin County.
As it sounds as if you are a mom to young children, I'd highly recommend joining the Southern Marin Moms Club. For a small annual membership fee, you can ask MANY moms their opinions of all the different towns in Marin. the link for the mom's club is: http://www.southernmarinmoms.com/
Both are beautiful, share the same schools and are graced with gorgeous water views. As you know, one of the biggest draws to both Tiburon and Belvedere is the stellar school system and proximity to SF. Commute time is about the same from the dowtown area of Tiburon and Belvedere.
Tiburon is larger in size and population, and has more real estate to choose from. Tiburon has more overall geography, open space and recreational space. Lots of families!
Belvedere is a steep island with higher density overall. The flatest area consists of mostly single story to some two story houses on the Lagoon:
(Lagoon streets are San Rafael Ave., Windward Rd., Lagoon Rd., Cove Rd. Peninsula Rd. Leeward, Edgewater, Maybridge Rd.). A lot of young families enjoy living in this area because it's so easy to access the lovely bike and walking path down Tiburon Blvd., walk to town, schools, the local park and the Tiburon Peninsula Club - a local gathering place for both residents. http://www.tiburonpc.org/
Enjoy great photos, stats and real estate info for both towns:
Hope this helps,
I have just assisted a couple with 3 children locate here from Orange County California and found them a beautiful home in Tiburon.
Contact me if you have any other questions.
Both Tiburon and Belvedere are family friendly and share the same great school district. Many Tiburon and Belvedere homes have fabulous views of the Bay and even the Golden Gate Bridge and the City. Other than than Lagoon area, Belvedere is an island and tends to be more vertical with narrower streets and upslope lots. Tiburon generally has normal streets and flatter lots for outdoor play areas and pools.
They are both beautiful towns and well worth exploring the available homes. You'll get a feeling in an afternoon of looking which area will best fit your families needs and desires. Hope that helps! Warmly, Jen