Listen.  You cannot dispose of this fountain, disperse these people, without giving them a place to go, otherwise you are just moving the problem to other people and other parts of town.  The city owns vacant land. Fence that land, put in porta potties, benches, electricity, water, and police it for safety so that people have a place to go.  Nothing is going to be ideal, but this fluffy approach is akin to knocking down a hornets nest...they move elsewhere, nearby. Crack down hard on public intoxication, panhandling from cars, sleeping in tourist areas.  Was at an event last night where we talked about not feeling safe walking around our community.  Make the community, not just this park, safer.