Only the grandparents and a great aunt live locally, so it will just be a group of 9 including us and the girls.
The girls' birthdays are 10 days apart, so we're doing a combined family birthday on the weekend inbetween, and on each birthday we'll do presents and cake with just us.
It's summer here, so I'm looking at doing a garden party type thing with flowers and butterflies, club sandwiches and cupcakes. Nothing major, just I'll decorate the cake with flowers and get some fresh flowers and decorate them with butterflies.
I don't think there is a TOO much. I mean there are plenty of things I wouldn't do, but a lot of that is dictated by my budget and how few family we have close by. If someone else wants to hire a hall, and go all out with decorating and catering then all power to them, sounds like a fun party.