If I were you, I would do everything with my ownhands. Now in the age of the Internet you can find a lot of great ideas on how
you can decorate the party. For example, you can find https://birthdayimg.com/happy-birthday-beach-image/
and print out happy
birthday beach images and place them all over the beach or near the beach, so
your guests know how to get to you. This will make your happy event special.
Also, do not forget about the balloons. With them you can perfectly complement
your happy birthday beach images