Suggestions on mountain bikes or road bikes?

My boyfriend and I want to buy bikes but we have no clue what were doing when it comes to the right kind of bike. We live in San Francisco, which is very hilly, and we plan on riding them mainly on the street or through the park, nothing extreme. Can someone recommend a practical and reliable yet not to pricey... show more My boyfriend and I want to buy bikes but we have no clue what were doing when it comes to the right kind of bike. We live in San Francisco, which is very hilly, and we plan on riding them mainly on the street or through the park, nothing extreme. Can someone recommend a practical and reliable yet not to pricey bike? Also if we need mountain bikes for the hills or a road bike?
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