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I would recommend speaking routinely with someone in spanish or at least watch tv shows occasionally to pick up slang words and phrases you wont get in books. also central/south american spanish is different than mexican spanish . or obviously the spanglish words i get thrown around at work. that's prob. what gives me the most trouble at times.
and vocabulary . I just need to learn more words because i do get stuck sometimes. I use spanish every day at work but try to pick up a spanish language newspaper and just read to pick up new words, try but i usually forget.
I watch novelas sometimes you hear the lovy -dovey phrases couples use, but they'll always lose me on the evening news they talk so fast.