Shorebirds are active depending on the tides! See them in their colorful spring plumage when they are easier to identify. Beginners welcomed and encouraged. Binoculars available for loan. Meet at the observation platform near the end of Broadway. No registration; drop-in. For information, call (510) 544-3187. DIRECTIONS: Elsie Roemer Bird Sanctuary/Crown Beach (Meet at platform between Broadway and Park Street, Alameda): From I-880 (North or south) take the 23th street exit and go west on 23th. (From 1-880 North you…