If you go to a restaurant, be sure it is not one which is messy eating. Depending on your age, and who you both are, I would suggest the classic movie, or as previously stated a park, however any entertainment, such as museums, symphonies, ect. could be applicable.
Anyplace you can be active & have some fun. This way you're not sitting there, staring at each other for two hours, asking each other silly mundane questions that make you both feel like you're on a job interview.
Safety first! You should be some where well lit, in public, where there are lots of people around - especially if you recently met! And try to meet at that place, & don't go with them in their vehicle or later to their house or a friends house. Don't let them meet at your place either. Take your time getting to know him first.