It's slap in the middle of grockle season down there so the best bet is to park in Dorchester and get the train down. From the railway station, it's a goodly walk or a bus ride. Go to the sea and turn left. B&B accommodation is always at a premium in Weymouth, so book early if you intend going. Personally, I'd stay elsewhere and commute in, but be warned, the last train is probably going to be long before most things finish.
Don't mention rabbits.
And I've a funny feeling I knew James Findlay before he was born....