Do they have a favorite band or artist? Maybe there's a favorite team they like to root for? For a larger budget, many tickets for a sporting event, concert, show, art or other events can be purchased through Ticketmaster. The site is arranged by category (such as "concerts") and then more specifically ("country," "jazz," "pop," "rock," etc.) and is quite easy to navigate. If you really want to go all out a special getaway vacation is a great choice. Package deals for anywhere, from a Disneyland resort to a cruise, can be easily found online. Maybe just a visit to family or a friend is just the thing they would love. Cheap flights are always easy to find at Expedia and are sure to make a memorable experience for your 18-year old.