I have found that you need to be right at the back of the town to hit a balloon. It's much tougher than on the Wii, isn't it!
I've only successfully shot one down as well!
I've never seen Pete in the air, nor a UFO, which apparently is a part of this game (I've only heard a UFO once on the Wii so they must be ultra-rare).
Re Watering - I only water the wilted flowers. I am not trying to create hybrids (although I now have about 6 in my house), as I am waiting patiently for the gold can. Only then will I cluster the flowers into arrangements. At present they are just scattered all over the place. As I understand it, each time you water only lasts for one day, but flowers seem to randomly wilt each day. So I don't think you CAN over-water. You just need to water the wilted flowers.
Each hybrid that I have accidentally created (all of'em) have appeared by flowers that have NOT been regularly watered, so it is very different from the Wii in that respect. All it seems to take in this game is to put the appropriate flowers next to each other, and water them if they wilt.
