Are you sure the mulch is cedar? Mold on top tells me it could be wood chips as sometimes mulches are now sprayed or tinted  to give them more color. A cedar mulch is great for pathways or pet areas as cedar decomposes slowly and repels water keeping down weeds. Perhaps you can recycle it as a path through trees or in the service area as a surface for garbage bins or in a kennel area. Cedar chips are not a great mulch for flowers as it keeps out the rain. You can also use cedar chips at the base of a compost pile. Just rake it into a corner and sandwich grass clippings and other debris between layers of the chips. Make each layer 4 to 6 inches deep. Like making a lasagna of chips and green material. In a year you should have moldy chips that look dark and rotten. This makes a better mulch for on top of beds and around shrubs to keep down weeds. One more idea - give it away  on a neighborhood website to whomever wants to haul it off first. Keep growing, Marianne Binetti