Op it's wonderful that you're taking the time to think about your household and try to grow and change things if need be.
I feel my parents were pretty strict (some things more than others) but particularly with food... I know my mum was doing what she thought was best but it did give me no self control and once I was on my own I went pretty off track for that reason I'm a big believe of everything in moderation.
As for 'fun things' I don't think it has to be an expensive outing or anything like that, it's family time and quality time that's important, I remember as a kid I would beg my parents to take me on picnics, even in the garden I didn't care as long as it was a packed lunch and my parents! they took me on 2 picnics my whole life... So it's wonderful that you take your kids on outdoor outings, they will cherish those memories.
Maybe ask them what they would like to do and take note