Hi,
Hervey Bay is the closest ... but ... there is also a private air park at Pacific Haven just out of Howard which is about 30 minutes from Toogoom. There is also a private strip just out of Burrum Heads (on the right as you head out towards Howard) fronting the road however the last time I went past even though it was well maintained it had the gables across the strip. Further afield there is the Childers strip (about 40 minutes) and Maryborough (also about 40 minutes).
Happy hunting ...