Welcome New G+ People
When I started out a few months back, not knowing much about G+, except that it was good for pictures, it took me a while to find my way and discover the streams that I like. I was searching for food streams. I stumbled upon a few people who lead me to the my current streams.

I'd recommend starting with Daily Photography Themes where you might find something that fit your interests. You might also search the hashtags (e.g., #foodfriday ).

Here are my recommendations:
Daily Photography Themes
https://plus.google.com/u/0/104772045073519492155/about

Food Themes:
#FoodFriday #sweetssunday #streetfoodsunday
Edit: #fruitsfriday

Please feel free to add more of your favorite themes and hashtags in comments.
Photo
Shared publiclyView activity