A neighborhood park shouldn't be an all-inclusive, Disney-like affair, a city unto itself; it should be a stopping-off point, a quick breath of fresh air in the heart of a community. It should be good for a few hours of reading, some basketball, or as a place to tie your kid's shoe while the dog tries to knock him over. Riverside Park isn't fancy. It's a neatly maintained strip of old trees, a playground, a basketball hoop, and tennis courts encircled by leisurely one-lane roads. Approach via the restored Palm Avenue swing bridge at one corner; all around are residential neighborhoods to explore on foot when the park has served its purpose and it's time to move on.