Practice listening and writing. Rent a Spanish-language movie and watch it with English subtitles. Watch a second time without subtitles. Write a summary of the movie in Spanish. Use a Spanish textbook to correct your spelling and grammar.
Practice reading and speaking. Join a Spanish conversation group or create your own. Buy Spanish-language newspapers; read an article at a group session and discuss what you've understood.
Practice listening and speaking. Find a native Spanish speaker to practice conversation. Use Skype to speak face-to-face with your conversation partner if he doesn't live in your town.
Practice reading and writing. Join a Spanish-language online forum. Create your own posts and respond to others' posts. Mimic the grammar and syntax used in other posts to formulate your own.