Happy New Year Knapp and Ginger and the boarlettes 
Boars are 100% Love Sponges (I had sows as a child and a young male but he had a 
demise thanks you his bullying wifey)
DD has her two boys and we try to give them as much space and activity as possible.
They love tunnels and boxes ( with two doors - one pig will always be more dominant, you don't want to risk the milder one being trapped)
YY they love a paper bag (Primark bags with the handles cut off - GP1 got stuck in a handle and was very ragey, though he could have bitten his way out, it's paper)
Those cardboard hay tunnels and the plastic tunnels last ages, and you can re-arrange them. We like to confuse them keep them entertained by moving things round when we clean the houses.
Make sure there's no staples or tape though, can be fatal if they ingest them.
Our weren't impressed by ramps, never used the upper level to the haybox, unless they were put on the roof and ran down towards the food. We took it out to give more room.
Boars WILL have the inevitable scraps. (There are loads of "My boars are fighting" threads ). Keep the food / veg /water well spaced so there's no crowding.
My two original boys were fine if they had their own hide-away/ get-out space (and no coriander, it made them fighty)
Now we have the older boy and our piglet who is about 7 months old, they like to sit apart but within hearing distance. They are pretty good at respecting each other.
Enjoy your piggies, they are lovely 