The Rail Trail is safe and pleasant. It is also busier than a first-timer expects, and the risks are specific.
Road crossings. The trail crosses public roads at grade in a number of places, and the ones on busy routes are the ones to respect. Some are signalised, some are not. A rider travelling at speed with the sun behind them is easy for a driver not to see. Slow to walking pace at crossings and do not assume a stopping car has seen the second rider behind you.
Passing. The most common incident here is not a car. It is a rider overtaking a family group without calling, on a trail where a five-year-old wobbles unpredictably. Call clearly, pass wide, and if you are the family, ride single file where the trail is busy.
E-bikes. Numbers have risen sharply and speed differentials on a shared path are the real issue. If you are on one, ride at the pace of the traffic rather than the pace of the motor.
Timing. Early morning is a substantially better experience than mid-afternoon in July and August. Shoulder season is better again: September and early October give you warm days, thin traffic and the bogs turning.
Sun, wind and water. There is very little shade on the canal service roads or the dune loops, the wind on the canal is stronger than it looks from the car park, and there is no drinking water for long stretches. Carry more than you think.
Ticks. If you stop and walk into the grass or scrub beside the trail, check yourself afterwards. Tick-borne illness is a real local health issue on this peninsula rather than a theoretical one.