As for research priorities, players should make sure to research Shops & Stalls only at first (max funding, as always) for the Cash Machine so that Electric Fields' guests won't end up out of money later. After that, players can build some thrill rides then follow up on a couple roller coasters.
These roller coasters should have high guest capacity, which means that pre-built roller coasters will require a (not too) long queue. This might come in handy later.Starting by May, food and thirst will become a problem. Players should fix this quickly, by building food & drinks stalls, then a couple Toilets across the park. By charging all those accordingly (at least $1 profit on all stalls and $0.20 on Toilets), stable earnings will come, allowing any player to make weekly benefits. Clever players would place the food & drinks stalls inside the shed, towards the bottom, with some benches in its front for people to sit & enjoy their product without clogging the main pathes. Players will only truly need about a couple roller coasters and a handful of other flat rides to complete this scenario, which will be easy. Other useful shops and stalls such as Hat & Balloons Stalls will raise the park's income. These should be placed near the exits of the park's most popular rides.
Players still short of the required guests should start marketing campaigns near July Year 2, even though If players built long queues for their rollercoasters, they can choose the less expensive "Ad campaign for a ride" option. Free tickets also will work wonders, even though this should only be done as a last resort option.
Electric Fields should be relatively easy, and hardly pose any problem to any player.