If you have studied traditional Spanish, you will, for the most part, be fine in Uruguay. However, there are a few variations in pronunciation that might come as a surprise. Here is an interesting perspective on the difference between Rioplatense and Traditional Spanish.
Lisa Marie Mercer
Site co-owner Lisa Marie Mercer, AKA Lisamaria. Long-time fitness pro, travel writer, nonfiction and novel author, historical guide. Follow author Lisa Marie Mercer at her Twitter @Lisamarimer, and find all her other many sites via https://About.me/LisaMarieMercer - blogs, writer portfolios, Google+, Facebook, and more. View all posts by Lisa Marie Mercer