Do the Daily Challenge
Every day, there will be a new set of challenges for you to get through. It's a random group of holes that you'd see scattered throughout the campaign mode. This is an excellent way to fine-tune your skills and have yourself prepared for whatever random challenge pops up.
If you can complete the holes in as few shots as possible, you'll have a chance to climb up the leaderboard. It's simply a fun detour away from the main game mode and it's a good way to get your fix in, playing on just a few random holes.
And even if you aren't deep in the main campaign, you may play some of the holes that you haven't played yet in the Daily Challenge. So when you do come across them in the campaign, then maybe you'll have a familiarity with them already.