There is no Constitutionally protected right to violate the rights of others while in the course of exercising one's own rights. It's only an abridgment of rights when the law or ordinance is post ex facto to the action at hand. Since the ordinance is preexisting, no rights have been abridged or denied.
Once you've grown tired of sleeping outdoors and another cause grabs your attention, you will go back to your homes, apartments, or dorms - and the other 99% of Long Beach residents will be subject to tent-cities cropping up in our parks and beaches - A handful of hand-made signs will guarantee the right to form encampments all over town. How much more selfish can you people be?
Hague v. CIO : "The privilege of a citizen of the United States to use the streets and parks for communication of views on national questions may be regulated in the interest of all; it is not absolute, but relative, and must be EXERCISED IN SUBORDINATION to the general comfort and convenience, and in consonance with peace and good order; but it must not, in the guise of regulation, be abridged or denied." 307 U.S. 496 (1939).