As you're interested in history, visits to sites can also provide the opportunity to meet people. In lots of cases, you don't need experience just enthusiasm.

It's very tempting to surf the net or read, but on a nice day does seem a waste.

You're interested in psychology, so why not contact local services to see if you can sit in on group sessions. If you only do the drinks, it's a good use of your time. Often charities welcome volunteers, if only to collect money. I've done this for a military charity in the UK. What a great variety of people I met, from members of the armed services to the general public on the street. It's natural to question if you can do it. That's normal. When you hear how much a charity has raised, it's a good feeling to be part of that effort.