http://whynot.johnnyrockets.com/index.html

Description:
Enter Johnny Rockets' Why Not Sweepstakes for your chance to win a week-long Caribbean cruise for four.

Eligibility:
USA, 18+

Start Date:
April 04, 2011

End Date:
June 05, 2011 at 11:59 p.m. ET

Entry Frequency:
One time per person/email/telephone number.

Sweepstakes Prizes:
Grand Prize: A Royal Caribbean Cruise for four including a 7-Night Caribbean sailing onboard Liberty of the Seas or Freedom of the Seas in a quad-occupancy stateroom and standard guest cruise accommodations. (ARV: $3,828)

Additional Comments:
Alternate entry by text message.

Note that you have to confirm your entry by email for it to be counted.