I can be kicked out of any place that has a gun buster sign. Nothing new. It's not a crime unless you act like a jackwagon and want to prove some point, then it becomes a trespass misdemeanor.
Conceal Carry away bro!
You can't be kicked out of a public park for it as evidenced by Spencer getting the signs taken down because they were in violation of state law. Again the issue is whether it's a public park or private property. If it's public allow legal carry, if it's private then the taxpayers should be reimbursed for their money that's been put in to make it possible and no more public funds should be used for it in any way, remove it from River Parks ownership and let Kaiser's LLC. completely fund it.
And while I agree in principle with your comment about "conceal carry" imagine your at the park with kids and wife enjoying a wonderful day and are carrying because it's your right and let's face it you're in a very high crime area. Then some anti gun busy body spots you printing and freaks out because you're endangering her little kid. Then you can either cancel the family's day or go leave your gun in your vehicle in a high crime area or maybe have to take the shuttle back to where you parked and leave it there, all because somebody has decided rights are trumped by feelings/ideology.