Tipping in Venezuela:
- Restaurants: First you check if they include the 10% services fee. If they DO include it you do NOT have to leave any extra tips, though if you feel it was very good and they deserve it, you can live an extra 5%.
In the case they do NOT include the service fee you usually pay between 5%-10%. Also it depends on how high or low is the bill. A 3000 BsF meal (say a 5 people eating a lot in a fancy restaurant) doesn't need to have a 300 BsF tip as this is a lot of money for one service, while you can leave say 20 BsF tip for an 80 BsF meal extremely cheap meal) if you think they deserve it.
For things like hotels you can leave anything from 20 BsF to 50 BsF, to me it seems like a good tip. You don't have to tip all the time, just when you feel they were helpful.
At the grocery shop there's usually a kid that helps you packing the bags, anything from 2-10 BsF is good for them. Sometimes there's someone that watches your car while it is parked, we usually give the same amount (5-10 BsF) or nothing, personally I don't give them anything unless they are being helpful (like they find you a spot, or they stop the traffic for you).
People asking for money in the streets get nothing from me, though is anyone tells me that they are hungry and need money to buy food I might buy them some food.
Advice: If you are planning to stay in Venezuela, LEARN SPANISH. English won't get you very far, but some mid level spanish will do WONDERS for you. People in here will try very hard to understand you and help you out, but this also means you have to give them something to hang on, without some spanish it will be impossible for most people
Another piece of advice... Eat arepas, they are wonderful 