A portable toilet assembly has a twin-sheet thermoformed toilet tank, base, and urinal. The toilet tank has an upper thermoplastic sheet which is fused to a lower thermoplastic sheet. The toilet tank sheets are each coextruded from two thermoplastic materials of different colors, such that the toilet tank interior is a dark color and the exterior is a lighter color. Portions of the fused sheets extend outwardly from the tank and define flanges which can be used to attach the toilet tank to the toilet base and to the walls of a cabana. The toilet tank lower sheet has a downwardly extending pyramidal sump in which waste can accumulate. The base has a hole for receiving the toilet tank, a platform with downwardly extending sidewalls with outwardly extending ledges, and channels which extend through the sidewalls and ledges which allow flow of liquids from within the cabana and ventilation of noxious odors. The lower portion of the base has axle bearings in which an axle can be placed which runs parallel to the front and rear sides of the base. A urinal is attached to the toilet tank. The urinal has an interior surface with projections which contain and hold a solid deodorant.