For both our boys first birthdays we just invited families around, one was out for a sunday lunch and the other was a trip to a local ice cream farm with grandparents, simple and nice.
The presents thing we have struggeled with getting our message across. Most of the people that would be buying presents don’t have the same way of thinking as us. Rowan will be 4 in September and finally people are getting the message! We have asked freinds not to buy presents, at which a lot of them either ignored us or got insulted! And MIL will just buy any old crap that she thinks the kids will love, pity it goes to the charity shop as soon as the novelty wears off (which is pretty quick!) She has got the message now after noticing that they don’t have any of her presents anymore!
I think you just have to be really honest and say you would rather that he has no presents than plastic ones, or maybe give them the myraid catalouge and a wish list (this is what my mum likes to do)