Nice flower images Jon. I used the Apps Plantnet and PlantSnap and got the following IDs. They look right but might be slightly different. At least I think the families are correct

1. Golden Arrow,
Plumeria pudica
2. Yellow-vein Eranthemum,
Pseuderanthemum reticulatum or Carruther's Falseface,
Pseuderanthemum carrithersii
3. Hibiscus species
4 Tahitian Gardenia,
Gardenia taitensis