We have two children: a 20 month old girl, and a 4.5 yr. old boy. They're both wonderful!
So far, our son is a quiet-type, and generally shy. He has a few really good friends, rather than lots of acquaintances. He loves to bike (he has a bike with training wheels, and a tag-a-long bike that mounts to an adult bike), play soccer, eat chocolate, go fishing, catch bugs, pick flowers, and talk to people he knows well (such as us). Boy oh boy does he love to talk. His vocabulary is in the hundreds I would guess.
So far, our daughter is an outspoken-type, and generally doesn't slow down for anyone or anything. She doesn't really have "friends" yet, but gets along well with others her age. She has a great laugh. She loves to "read" books (alone or with others). She likes giving kisses. She loves riding her tri-cycle, being mischievous, and always has an agenda. I'd say her vocabulary is a couple of dozen words or so.
We are so blessed to have such great children. Their hearts are filled with joy and love. They love eachother so much, and there is no greater joy in life than watching them play with one another, and help eachother out throughout the day. Big brother loves showing little sister the ropes and how to do things.