a family group of mature boar, sows and piglets is quite noticeable.
rooting, nesting, wandering about with squiggly piglets etc all have strong sign or direct observation
i would be aware it (or they)may be around but not very worried, they will avoid you if at all possible (or steal your lunch) and are only dangerous if they see you as a threat, if so back off politely telling them you will go that way so they can continue doing piggy things
a few apples and a night in a tree with a night sight is a viable option if they do seem to be a problem
We do have the option of a trail cam if we think they have been in our bit of the wood. No sign of rooting that I have seen, but do have dogs and badgers digging, so may have assumed it was them. Hopefully just a lone one passing through.
Yes, I would expect them to be on fruit for sugar at this time of year. I was surprised to see hornets on the grapes a little while ago; of course they could have been taking insects that were on the sugar, but I didn't have my glasses on, so wouldn't have been able to see very tiny insects.
Had a visitor in our bedroom yesterday morning. I looked up and there was a robin sat on the inside windowsill. It didn't seem particularly bothered, but as I approached it, it flew out of the room and along to the front of the house. Found it in the front bedroom, so opened a large window, but had to get between it and the window to do so, so it flew back. Went back to our bedroom and opened the big window there and eventually it flew out. I asked it not the make any mucky messes, and as far as I can see it did as I asked. The only way it could have got in was through the fanlight which was only open a tiny bit. Amazing how small a gap small birds can get through; we noticed it with the bluetit that nested in the kiln in the spring.
They are falling well here too. Unless your remark is cryptic of course. We have been living in a rain of beech leaves in the woods the last week or two.