Our macadamia trees are smothered in sweetly smelling racemes of flowers right at this moment. The bees adore them and I think they're extremely lovely as well. We have a little copse of macadamia trees but these are a little unusual because of the beautiful pink colour; the other trees have cream flowers. We usually have a very good crop of nuts too, although last year was disappointing, I presume because of the drought.
Info on Macadamias here