I generally tend to do small things; e.g. hold doors open for people, help them if they drop something, direct them if they're lost on the tube that kind of thing. It's worth noting that when I hold doors open for people at Uni, the guys thank me but the lasses don't. After a bit of research turns out this is the case for most of the guys I know. So ladies, be a bit more considerate when we help kthnx.