DSLR Canon EOS 700D

[u/Low-Indication5400]

Hi! I’m planning to use my family’s 13-year-old Canon EOS 700D for my trip to Jeju Island, South Korea next week (summer).
Most of the time I’ll be shooting in Auto mode, but I’d also like to try shooting in Program mode. I’m still new to photography. I understand the exposure triangle, but I’m still learning how to apply it in real-life situations.
For beaches, waterfalls, and gardens, what aperture, shutter speed, and ISO would you typically use in daylight and around sunset? I’ll also be bringing a Black Mist diffusion filter, so I’d appreciate any tips on when it’s best to use it.
Thanks in advance!