Printable Spanish activities can keep children reading, writing and thinking in Spanish during the summer. It is common in Spain for teachers to compile work for their students to do over vacation. The activities can sometimes be a little dry and boring, depending on the teacher, but they can also be a valuable way to maintain contact with the language.
Below are several sites with cuadernos de actividades at different levels that you can print at no cost. All of these are PDFs and some of them have lots of pages. I suggest you choose the pages that you would like to use and print only those.
1. This site is the portal for CEIP Santo Tomás de Aquino in San Sebastián de los Ballesteros, Spain. It offers six printable activity workbooks: Educación infantial 3 años, Educación infantial 4 años, Educación infantial 5 años, Primer ciclo de primaria, Segundo ciclo de primaria and Tercer ciclo de primaria. The quality of the workbook for Primer Ciclo de Primaria is not very good, but the other PDFs seem to be okay.
2. This is a page of the blog Aula PT with links to lots of printable activity books. Some of the material is from Cuadernos Digitales Vindel which offers free reading and math activity books. The materials on Aula PT are listed by level and many are appropriate for Spanish language learners.
3. This site from El Departamento de Orientación de Andújar (Spain) has printable math workbooks for primary grades. Kids can learn a lot of Spanish as the practice math!
4. On the site Cucurrucu, they have PDFs of summer activity books prepared by el Colegio Arturo dúo de Castro Urdiales, Cantabria, Spain. There are language and math books for all the primary grades.
5. The Eduwiki de Virgin del Carmen (Andalucia, Spain) has a collection of links to printable material. If you scroll to the bottom of the page, you will find a section called Español para extranjeros with links to several activity books for Spanish language learners.
6. The blog Fichas para infantil y primaria has a Banco de lecturas for several different levels. Scroll down and click on the image of Lecturas-Primer Ciclo, Lecturas-Segundo Ciclo, or Lecturas-Tercer Ciclo.
7. The blog 3º de primaria: ejercicios, recursos y actividades has a page of cuadernos para el verano. The first link is to a Cuaderno de refuerzo, but many of the exercises are based on readings that are not included. The final link is to an activity book from Colegio San Agustín de Valladolid that has activities related to many subjects. It does include the readings and many activities.
8. El club de los pitagorines is the blog of 3º y 4º CPEIP José Luis De Arrese de Corella, Narvarra, Spain. There are three different printable workbooks of material that they prepared for their students to use over the summer. There are also links to interactive materials, most from Editorial Anaya.
9. Finally, on a lighter note, here are a few activities from the Kent District Library in Michigan. I ran across these and have not known where to include them. They are not a workbook, but the activities are kind of fun.
You may also be interested in this post: Free Activity Book for Teaching Children Spanish