2 year old birthday?

Okay so my son is going to be 2 and I have no idea what to do for his birthday. I was originally going to book a build a bear party at the store but they aren't taking bookings at the moment.

I can't throw a small birthday party for him as my brother and sister do not get along and as much as my brother wants to be civil with her she doesn't want to as they had an argument and basically she doesn't want to be around him or him around her kids (the argument wasn't anything to do with the kids) so even if I was to have one I can't pick one over the other as their both family and close with my son.

I'm so stuck on what to do I was trying to find somewhere to take him for the day out with my mom so then I don't have to invite anyone or either of them and it would be a lot less drama with my brother and sister.

Can any one suggest any ideas and activities for a 2 year olds birthday? Also toy recommendations would be appreciate!

Thank you