The only advice I can give here is to make sure all people who were close to your dad are consulted.
I organised my dad's recent funeral pretty much on my own, as my mom and brother didn't really want to be consulted and were dealing with other things. Because I don't have strong feelings about the actual remains - just a personal feeling, my memories of dad are in my head and his physical location now doesn't make a huge difference to me personally - I agreed for them to be scattered in the scattering garden at the lovely crematorium we used, as it seemed the simplest thing. (It's basically the default option if you don't want to collect the ashes yourself and don't have any other strong feelings about it).
However, my brother has now said he would like us to be able to go and visit my dad's last resting place annually as a family.
Luckily, the crematorium is lovely, and somewhere we can all access fairly easily. But I wasn't factoring this into the decision, I will be honest.
There is no rush. Take your time. There may ever be someone who has had a discussion about this with your dad and knows where he would prefer to be. (I am going to make sure I discuss this with all loved ones going forwards, before, like my dad, they become too unwell to understand the question).
Sorry for your loss, hope you are ok. Xxx