The first Advent Calendar is an obvious choice:
This one is all filled up with special activities that we will do together as a family. Some activities are pre-planned events (Santa Train, family Christmas Party). Some are crafts (cut snowflakes to decorate windows, makes an ornament) and some are charitable activities (buy a toy to donate to Toys for Tots).
The second Advent Calendar we have is a Playmobil one that has a different little piece to add to a winter scene each day. Matilda is loving this one! So far we have 2 trees, some squirrels, and a couple of raccoons.
The third Advent Calendar we have is for Mom and Dad. It's this darling one from Starbucks of all places. It has a magnetic chalkboard background with 25 tins filled with a little treat. This will be a nice calendar to reuse year after year.
The fourth Advent Calendar I have planned is really just more for decoration. It is the Silhouette Advent Calendar shown here: