I personally believe I'm not only good at first dates, but also second dates. However, I can't say my track record is the best beyond that. I have been on several dates with people that I later didn't get into a romantic relationship with. However, I knew I had to improve on my second date skills if I were to improve my love life.
The getting to know you phase in a relationship or romantic encounter is awesome. Many of us, do not start showing our true selves until the second, or even the third date.
You definitely want to go more extravagant date wise. If you did dinner for the first date, go to a nicer place, and even budget for a movie. You can then see how cool the opposite sex is with you in an intimate setting.
This date should preferly not be at the home, or around too many close family or friends. You are still trying to feel this person out, see how they are. This is the time to learn their long term and short term goals, their feelings regarding sex and marriage, and even what else interests them.
Creativity is fine for the second date. A play, a concert, or even a festival would be nice. Walking and talking can build the chemistry further, and it can ease the tension.
Finally, the date is over. Unless you established it earlier, I wouldn't try for a nightcap just yet. Simply give that person a gentle hug and kiss on the cheek, forehead or the lips. You can do more if both of you are feeling it. However, take your time.
That being said, if they are interested, date number three should not be far away. And unless both parties are celibate, sexual feelings should be expressed in some form at this time. Aggression is not necessary, but the other person must establish that you are very attracted to them and this is more than a friendship. The second date usually starts determining whether you're going to be friends, enemies, or potential mates.
Most of what I said can be applied to a third date, and I may write another piece about the third date. Just keep in mind the second date needs to be good and relaxed. It's similar to a second interview for a job. You're trying to close the deal. To achieve more, you naturally must do more. Also, show that you will continue to do so throughout the relationship with each passing date.