Posting this here as I am not brave enough for AIBU, so please be gentle, even if I am U 
DH & I are away with our 3 Dses, all primary school age. We have come camping for 4 nights & will have 3 days at destination. Destination is near a theme park & also 20 mins from where his childhood best friend lives- DC & I are also friends with them, but not to the same extent as DH.
We have been to theme park today, (was mostly him on big rides with DS10 & me with 1 or both other Dses), were going on walk/relaxing tomorrow, then theme park on Tuesday with above friends. Now DH has had a message from friend suggesting we meet up tomorrow for different walk & tea room, as well as theme park next day. I have said I am not keen as was looking forward to tomorrow as family time & seeing friends next day. Also would like to discover things our way rather than being shown plus they walk further & quicker than us. DH got very stroppy about this & has gone to bed in a huff, saying he doesn't get why I don't want to see them, we see my lot more & I'm a kill joy. So I suggested he ask them to our campsite for dinner & play/chat, but he said it's boring & too late if we're up early next day for theme park. He also wants to visit his parents on way home, although he saw them 4/7 full days last week & will again next Saturday, at least. This was not in original plan, he suggested it on drive up here.
For background: we live near my family (same village as my parents) but don't see them every week, as we're all busy. We went on holiday with them for 4 days earlier this month (but haven't seen them since), also camping for 3 days with my friends but we took 1 day to ourselves. We also went camping with his friends (above) in late May for 3 nights & he sees him when they go to football matches for pre-match pint. So doesn't see him loads but roughly once a month/6 weeks? Distance is 3 hours drive. He sees his parents roughly every 2 weeks for full weekends in school hols, but once school term starts is trickier as he never has full day free & is 2.5 hour drive.
I really want to get family time now as once school starts back, DH will be working again plus doing football with just DS1 for half of Saturday & half of Sunday every week, so we won't have much time as a 5 until October half term.
I guess it makes me sad to think he'd rather spend time with friends than just as a 5, but he says I'm being silly. I know he expects that I'll change my mind. He hasn't yet replied to friend's message.
AIBU?