Pack up all your equipment neatly as you found it, ready for other students to use, drink some water, talk with your fellow yogi classmates. Let the teacher know how you found the class, especially if you are not feeling right as a result of anything that you have done in the class. Leave the building quietly being respectful of the neighbours. It's not the time to do extra stretches or play around, your practice is complete and its good to feel the effect of it – also your body will be relaxed and mobile, if you throw yourself around you may injure yourself.