Location and planning
What you want to capture drives your choice of location and time of day and season of the year. Scout your landscapes beforehand to see the direction of the sun, any potential safety issues, or terrain considerations. Then return to shoot during a more flattering time of day.
If you are shooting flowers, note the time of year they bloom. With birds, you need to understand a bit about their habitat and the times of day that they are active. If you want to shoot more dangerous wildlife, it is best to go with someone experienced.
A National Park is a great location for both landscapes and wildlife. Make note that you may need to apply for special permits for some parks and that they also have seasonal or time restrictions in some areas. This will impact your planning if those restrictions include your anticipated shooting times.