My favourite in the exotics are trifectas.

I basically select 6 runners (usually the first 6 market favourites) with 2 or 3 of them set for finishing 1st and 2nd and the remainder to finish 2nd or 3rd I may include some others to finish 3rd depending on their prices. Field sizes about 8 to 14. I use flexi betting and target a return of 10 to 20 % on the trifecta dividend. The percentage return depends on the number of combinations covered. My bet is usually around $10.
I strike a few trifectas, approximately 1 in 3 or 1 in 4 depending on how things work out on the day. Like most punting there is good and bad days. I certainly will not get rich but I am manage to move my bank forward and it is entertaining. Keeps a SOB occupied.