I love mini-dates -- doing several date-y things in a row. I tried to find the article I usually reference, but I can't seem to find it (I keep finding "how to make him fall in love with you" ones like
this, but the basic principles are the same).
The key is to jump between places fairly quickly. We have lots of free things to do here (the museum, state library, a big riverside park, saturday night markets), and most have new attractions every few months, so it doesn't get too boring for me either
I went on one this last Sunday afternoon (a day-2) -- saw an exhibition of early panoramic photos at the library (and did the jigsaw puzzles upside-down -- fun and lots of kino), over to the park to watch a short film festival, an ice cream and a walk by the river, walk across into the city, make out on the bridge, found dinner at one of my favorite hole-in-the-wall restaurants that most people don't know about, more making out by the river, a few drinks at a great little ****tail bar overlooking the city, then back to her place for the night...
The mini-dates make her feel like she's known you for much longer than you really have, you get to lead her around (a perfect opportunity to take her by the hand), show her places that she mightn't know about, and just have fun. This is pretty much my standard day-2 now (I'll mix it up a little, depending on what's on), but it's got a pretty good success rate. And I think it's a lot easier to build attraction and comfort that if you, say, invite her over to watch a movie -- she'll have the anti-slvt defences ready to go the second she walks in the door. And since she's 18, you'll most likely encounter either the "I need to love him first" or "I'm going to make him wait # dates".