We’ve had a fun year with Salsa and plan on using the Knowitall videos next. My kids are 6, 4, 4, and 2. We just watch the videos and then I write down the words we’ve learned and post them near our kitchen table. We talk about the words and use as many as we can.
I’m also going to look for simple books in Spanish at the library, and may throw in the odd Spanish TV program just for fun.