Our reception hall is about 45 minutes from the ceremony, which is at the beach. There is also limited parking and limited capacity. We are offering complimentary transportation from the reception hall, to and from the beach, and want to strongly encourage it. We also want to give people the option of just attending the reception. I'm assuming some guests won't want to go to the beach and would rather just attend the reception, but I don't want to come across as being rude or make them feel like they have to. I'm just not sure how to word the invitation and response card. What is the etiquette behind this? Help!