In your shoes, my first call would be to your attorney. Why was there never a conversation about what was and was not included in the HOA fees BEFORE you closed? It's the attorney's job to interpret the Bylaws for you and to make sure you understand the minutiae of what you are getting into, before you get into it.
Which is not to excuse a possible oversight on the part of the listing agent, but at the end of the day, you cannot expect to rely 100% on a listing agent who represents the seller, whereas you can rely 100% on your own attorney who only represents you. However, (and please don't take this the wrong way), while I am sorry that you feel cheated, you do also need to take some of the responsibility yourself for relying on what is essentially an ad that is only intended to give a broad overview, rather than the very precise and detailed legal documentation that followed. The devil is in the details as they say.
Did you read the HOA documents? If you used an Agent, did he/she read it? Was the disclosure documents incomplete? If you didn't receive a complete set of documents, you might ask why. If you did and the information was in it, you are out of luck. It is the buyer's responsibility to check out everything about the property (including future use) prior to removing your property condition contingency.
The home owner association documents offered in the disclosure packet should have indicated what was covered and what was not covered. Make sure you did get a complete package. Review with your agent to make sure you received a complete packet.
If you did not receive a complete packet, I would suggest sitting down with the agent and a real estate attorney and determining your options.