Feb-Apr - bushwalking in southern Australia - in Feb, consider cooler alpine areas and Tasmania but be aware of
bushfire safety
Dec-May - avoid tropical far north Australia's wet season unless you like hot, humid wet weather with lots of insects, wildlife, storms, cyclones, floods, lightning.
April-May: great time for camping in southern Australia but in Easter and school holidays, sites are readily booked out well in advance
April to mid June - shoulder season for western Europe, pleasant climate, less crowds, cheaper prices
Turkey - warm, not too hot, wildflowers but remember overcrowded around ANZAC day April 25th!
April-August are generally best times for west coast USA but perhaps avoid Gulf of Mexico region mid-May-Nov as hurricane season
April-May - best for Machu Picchu as less crowds, clear skies , and also for Argentina
Mar-Sept - best time for Malaysia and Singapore as it is the dry season with less humidity
Mar-May - best time to see Japan's cherry blossoms but very busy
Apr-May - best time for Morocco