Some useful sites:

In these sites you are going to find all sorts of activities to all levels and some good dictionaries.

http://www .boggleswordesl.com
http://www.wordreference.com/
http://englishonline.sites.uol.com.br/english/basic.htm
http://www.merriam-webster.com/
http://iteslj.org/v/ei/kitchen.html
http://dictionary.reference.com/
http://www.smartkids.com.br/
http://www.bussolaescolar.com.br/
http://www.englishexperts.com.br/