Walk around at 10pm. Just don't walk in the closed park.
Is it inconvenient to walk around the park? Sure it is. Should people plan for that, knowing about it? Probably. Do people do so? Usually not. Same thing with jaywalking. It isn't the same as "how dare people walk across a street".
They're free to walk across the street - just do so at the cross walk. Likewise, they're free to walk around after 10pm - just not in the park.
Wasn't in the budget to build the park and likely wouldn't get approval for funding if it were. The alternative of an unfunded park is no park.
The tickets from people ignoring signs is also additional revenue to the town/state so there is some financial motivation to not spend money on a gate (and staff responsible for locking/opening the gate).
Is it inconvenient to walk around the park? Sure it is. Should people plan for that, knowing about it? Probably. Do people do so? Usually not. Same thing with jaywalking. It isn't the same as "how dare people walk across a street".
They're free to walk across the street - just do so at the cross walk. Likewise, they're free to walk around after 10pm - just not in the park.