Hi Matt and welcome to our friendly forum.
Looks like next year is going to be quite eventful for you.
I've been 3 times now and haven't encountered any major problems but nonetheless you still have to be careful in a country which has an awful lot of poverty. You shouldn't encounter problems as you will be staying with family who will help familiarise you with your surroundings.
If registering when you arrive will be put your families minds at ease then perhaps you should do it.
Above all have a fantastic time as I'm sure you will and don't forget to come back and share your experiences with us.