Boardgames are definitely a good idea. Props are another, you can different kinds of props and use them in so many ways! You could use them to practice role-plays, you do fun improvisational activities with your students or use it to teach different topics such as adjectives. Kinds of props could include animal hats, wigs, swords, capes, plastic fruit, vegetables or anything like that.
Another suggestion I would make is get lots of color paper, card board and felt. You can supplement lots of lessons with fun craft ideas, like using cardboard to make a sun visor if you're teaching a lesson on summer.
