For each snack, fill indentation of celery piece with about 1 tablespoon cream cheese, mounding slightly in center. Place on small plate, cream cheese up. Press 4 carrot halves, flat side up, across celery to make flat surface on celery to resemble raft.
Place tiny amount of cream cheese on one edge of 1 tortilla chip; attach to one end of 1 pretzel stick to resemble flag on pole. Push end of pretzel into cream cheese between 2 carrot halves.
Place tiny amount of cream cheese on opposite edges of each of 2 cheese snack crackers. Press cream cheese-covered edges of crackers to carrot surface, leaning crackers together to resemble tent. Attach teddy bear to raft near flag with small amount of cream cheese. Scatter fish-shaped crackers on plate around raft.