how could I reduce my income tax

hi all, My salary is $150k, my wife's is around $30k as a mum working part-time. We're paying quite a bit more tax than if we were earning the same amount, equally divided ($90k each), which has got me thinking - is there anything obvious we should be doing to try to reduce taxable income? e.g. investing in negatively-geared property, salary sacrificing, etc. Thanks!