So - I actually went through my plan book from last year and typed out what we did each day for the entire year in my first level Spanish speakers class. (I've been teaching this class for 2 years.) If you just got a heritage class, and you have no idea what to do, THIS IS FOR YOU! :) I wish I'd had something like this. This is what I would give a new colleague of mine. Obviously, you don't have to follow it exactly, but it's so nice to have some ideas!
Many of the activities are available on my TpT store, for free download or purchase. I would also high recommend using this in conjunction with my Course outline for a second high school course
so you have more information on each activity and the overall units, but it's up to you.
Last but not least, this day by day planner is organized based on the fact that I saw my kids 3 times a week for 80 minutes. So, you may need to adjust the time if you see your kids 5 times a week for 45 minutes (for example).