I spent an involuntary seven months off flying a few years back. I expected to be rusty, so booked an hour with an instructor. It was like I'd flown the plane three hours the day before, it fit like an old glove. Similar to India Four Two, float flying in seasonal here. My last water landing was in October, my next will be late April or May. And water landings or less forgiving of error than on a runway. So, I'm always extra cautious for my first few water landings, as checkouts are really difficult to get around here.
If you're attentive to possibly being rusty, that's an excellent first step. Another worthwhile habit, as India Four Two says, is to fresh up on not only flying, but airwork as well. Too many pilots I fly with admit that their last airwork was many years ago. It should be months, or at very most within a year ago, not many years ago!