T-shirt design needed for new, educational student travel company in US

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This customer received 42 t-shirt designs from 15 designers. They chose this t-shirt design from Alice Black as the winning design.
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T-shirt Design Brief
Hi - Design is needed for new, young, fun student tour company - Integritytours.com. My company takes middle & high school students on multi-day educational tours. Top 4 destinations are Wash DC, NYC, Philly, Boston - then Williamsburg, & Orlando. I've attached the 'idea' I have for the design - fairly simple and minimalistic - to be printed on the FRONT of the shirt. Looking for a 'skyline sketch' that integrates the top 3 destinations/highlights (DC - US Capital, Philly - Liber Bell, NYC - Statue of Liberty), with a generic destination text - EAST COAST USA. Then, my website address underneath design. Any background filler suggestions are welcome. Design is to be printed on a light green, a lighter/pale blue, TieDye, or light gray shirt AND able to be printed in any color. This NEEDS TO APPEAL TO 13-16 YR OLDS, and parents alike, as the shirt is an add-on for purchase, and want to sell as many as possible. Mainly 12 - 16 yr olds wear these, and some teachers & parents, so needs to look in trend and 'cool'. I'm open to suggestions.
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