I wonder why you didn't get any replies to this, and your course is probably over by now. However, for anyone else joining this thread2 1/2 hours is of course far too long - for both of you. There should be a clear break of at least 15 minutes at half-time. Diversity is crucial. Some young children are unable to stay focussed on any one aspect of an English lesson for longer than 15 minutes. It is essential to present your lessons in a ludic environment and manner - a child has enough traditional classroom teraching at school. games are an excellent idea, but don't use them all the time. Scrabble, and WordUp are good examples. There are also plenty of activity books* for children, and you could also base your lessons around the units and activities in course books* for children of that age. Check out the publishers' online catalogues.
Activity Book for Children, Oxford University Press
Get Set GO, OUP
Get Ready, OUP
the Jungle Grammar Book, OUP
etc.You'll also get more ideas in this department:viewforum.php?f=4