Heaven is all the most wonderful things you can think of. It's all your questions answered, all your dreams true. There's no night, no need for sun, and unfortunately no marriage in heaven (according to Bible references). But there is also no sadness or pain.. Only joy and absolute contentment. :)
I can promise you it's not just a white place. No electronics either. No need for them. But it'll be way better than you ever imagined. In the book of Revelation, it says what God's throne looks like. But there's so much stuff, it's really hard to comprehend. You'll be there for eternity, worshipping God the entire time. And there won't be any need for anything. You'll be able to ask God that unanswered question that you've been asking since you were three. He will give you a perfect answer. But trust me on this one: it'll be better than you ever thought.