In my opinion the vacant lot should become a community garden. I live in an apartment near the lot, and I have no yard, so I really want a place to grow my own vegetables.
Many people in our neighbourhood live in apartments like me. A garden plot can give us a chance to be in nature and grow fresh food. The yearly fee is small, so most of the people can pay it. Also there will be a shared tool shed, so we don't need to buy our own tools. I think gardening is good for the healthy and it help people to relax after work.
The garden also can make the neighbours closer. People will meet in the garden, they can share their vegetables and give advices to each other. Children can learn how plants grow.
A skate park is fun for teenagers, but it is only for one group of people. Also skate park can be noisy and sometimes have problems in the night.
So I choose the community garden.