If you are going to work with beginners, one of the topis you are most probable to be covering in the very first classes is the ALPHABET. So here I suggest a simple activity to introduce or activate the topic. If you are working with other levels (pre-intermetiate or even intermediate) this activity can be great for a warm-up or wrap-up. Hope you and your students have loads of fun!
Have participants/students divided into small groups. Tell them you are going to give them 5 minutes to find one item within or outside the room (they may take pics of the objects if they are hard to carry!) that begins with each letter of the alphabet, in order. At the end of the time alloted, ask each team how far they got. The tem that got furthest, wins!!