What would you like to know about Venus?

It is thought that Venus was named after the beautiful Roman goddess (counterpart to the Greek Aphrodite) due to its bright, shining appearance in the sky. Of the five planets known to ancient astronomers, it would have been the brightest.

Sorry, but exploration of space, even robotically, using a lander is very expensive. I doubt if much could be done for a mere billion dollars.

But a billion might be enough to fund a modest orbiter, and perhaps an atmospheric probe. However it would not tell us much (if anything) that we don't know already.

The Magellan probe orbited Venus in 1989 and was a serious project which used radar to map the surface of Venus. Russia already dropped a couple on landers onto Venus. There's not a lot we don't know that is worth knowing.

About the only thing I would like to see clarified is some definitive data about the cloud stratification of Venus. How many cloud layers are there, and what are their compositions? A billion bucks might be just enough to provide that data.

I would study the upper atmosphere for products that would support fusion reactors.

Venus is for women, Mars is for men. Why is Venus for women?

I would send maybe 5-6 small landers that are engineered to function easily in the 900 degree heat. Their main purpose will be to listen for seismic activity, i.e. Venus-quakes, to see if Venus is seismically active. 

A billion dollars wouldn't pay for research on a Venus project.

I'd assemble a panel of experts and ask them.