You always need to watch out especially when grocery shopping, many times friends may gravitate towards tasty snacks.
The Outdoors
In the vast wilderness you always need to prepare for your friends to run after a stray butterfly over the hills.
The Beach/Lake
Playing in the water is so much fun! Just keep in mind where your pals are so they don't wash away at sea.
Restaurant
So many tasty smells come from dinning establishments. Make sure your friends aren't sneaking to the kitchen for an extra helping.
Parties
All friends want to be the life of the party, just make sure everyone comes home safe after.
The Internet
This one is rather unique, unlike locations you visit in person. Sometimes you look around the vast web. Only to find your friend a couple pages back from where you just were.