Should I get representation regarding a misdemeanor charge?

Question Details: I brought my dog to a park. A sign said that they were allowed on a leash on the trails. My dog was leashed and we were in the shade a few feet off the trail. A cop asked us to identify ourselves and after asking why multiple times and not getting a response, he said that we'd be arrested if we didn't tell him. I then gave him my information, yet he still arrested me. He gave me a misdemeanor for "Obstruct Legal Process - Interfere w/Peace Officer". Now I have an arraignment and I'm not sure if I should plead guilty or get representation.

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