Birthdays are about celebrating the child, not about what relatives want. :glare:
If he's really into camping, and you don't mine missing out on more birthday presents, I say go camping.
Happy birthday to your ds! :party:
ETA: To answer the original question, our parties are small. We only have dh's tiny (6 people) family in the area, and we haven't found a local homeschooling group yet, we're the only young couple in our church, and I only have one friend who has kids, so our parties are 14 people or less.