Are you talking about Juniper Valley Park.? Actually, it does not matter where you are talking about. The only advice I could give, is to call 911. 311 can not help you with this. If it is after 10:00pm, call 911 about a disturbance and give the corner where they are hanging out or the location. You have the right to enjoy your home and live a peaceful life. Young people have the right to enjoy themselves but not at the expense of others and not pass 10PM.