Some portable gold reflectors and somebody to hold them would probably help in both situations.
A good tripod for the dusk/night shots.
An amber gel (film) over your flash could possibly enhance a sunset by only illuminating the subject with the filtered light, rather than the standard whitish flash.
If you're patient, you'll probably benefit by going manual and bracketing your shots. The automatic and program settings on your camera, at their default settings are probably going to fight with the results you're trying to get.
The monsters under your bed will only hurt you if you stop believing in them.