chrisgyo wrote:
no idea what extra ponds are good for
They have bonus multipliers, so helps you earn extra.
To respond to the OP though, yep. I think I'm up to 4 heart ponds now, with only two showing. The others are tucked behind some of the (thankfully) large buildings. I do the same with all the rubbish I uncover as I expand my land.
The ponds are a bit large to fully screen behind the trees, I think, but the forest makes a great hideaway spot for the rubbish, as many of those bits are smaller. Plus I have "strategically" placed tree infested areas nearby the nuclear plant, Cletus' farm and the Muntz home, so a bit of rubbish showing through the trees is kind of expected near those areas.