I think the occasional holiday abroad separately, to indulge your own interests, is no harm. But it shouldn't become the norm. You're a family now and you need to factor that into your holiday planning. Sounds like you tried to do that, but your DH was reluctant to change anything, and then whined when things didn't go to plan. Also, when your DD gets a bit older, she will understand what holidays are, and will complain loudly and incessantly that you're not bringing her.
I love sightseeing and a week by the beach or pool would be deathly boring for me. The odd day, fine, but not all week. We found Eurocamp style places worked really well when DD was small. We booked one near Venice which was a big hit with us all. It catered really well for families. There was a beach. There were a couple of pools, one with a pirate ship and a slide. There was a playground. There were even pony rides. There was a fairground nearby with little rides for kids. There was entertainment at night, although the commentary was all in Italian, so we couldn't follow it.
For us adults, we could go by boat into Venice and explore the nearby islands of Burano and Murano.
We stayed in a chalet, which allowed us a bit of independence. We could make basic things to eat (breakfast, sandwiches etc.). There was a coffee machine, so we could make decent coffee whenever we wanted. We could have drinks on the balcony when DD had gone to bed and get savaged by mosquitos.
We had a ball and went back a second time, to a different campsite nearby.
DH (now Ex) and I both worked, so holidays were as much about spending time with our DD and having the time to do things with her, as they were about sightseeing. Simple things like colouring with her, doing little jigsaws, making sandcastles on the beach, collecting seashells, drawing pictures in the sand with a stick, checking out any toy shops we came across and treating her to something new. At six months old, your DD isn't very active, but that will change. And when she's able to speak, she's liable to complain loudly and incessantly when the things you've planned are boring.
I've just asked DD what she remembers about the two Italian holidays and her memories all seem to revolve around food - the cookie she got on the aeroplane, the apple flavoured lollipop, the Minnie Mouse ice cream etc.
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In case I'm starting to sound like Mary Poppins, we still got lots of things wrong and ended up frustrated over one thing or another. For example:-
- We slept it out the day we were due to to go to the airport. Luckily, FIL was driving us to the airport and rang our doorbell at the appointed time. In our haste to get dressed and grab our cases and leave the house, we forgot Ted. Ted was DD's constant companion and the toy she slept with every night. Never forget Ted! We had barely arrived at the airport when we discovered Ted was missing. That was fun.
- DD was so excited about the holiday that she puked at the airport.
- DD was having so much fun on the beach one day that we decided to forego her nap. I mean, we're on holiday and routines can go out the window, right? Except the tiredness caught up with her and she ended up having the mother of all meltdowns. Right there on the beach, with all of the families around staring at us like we were the worst parents in the world.
- On our first beach holiday abroad, DD was very nervous of the waves. It had never occurred to me that a child might be nervous of the waves/sea. I'm not talking about swimming, just paddling at the water's edge. She would only go into the water if we were holding her up in our arms. Would you believe it, on the very last day of our holiday, she suddenly took to the water and was blissfully happy running in and out of the waves (with me right beside her, obviously). But this only happened on the very last day.
- The day we were heading into Venice, I put sun cream on DD as usual. Except I got a tiny bit in her eye. My own fault, obviously. So DD spent the first half of our day in Venice complaining that her eye was stinging her. Why did it have to happen the day we went to Venice and not one of the other days when we were just hanging around the beach and pool?
- Canals = still water = mosquitos. When DD went back to the creche after her holiday, she told the staff all about the nasty mossies and how they bit her and I'm surprised we weren't reported to child services.
I've digressed a bit. I think it's unfair that your DH had a lie on every morning. Fine to have the odd lie on if he was tired, but you should have had your turn too. And it obviously impacted the holiday because it meant your activity time was limited due to the extended siesta locally. Why is he so tired? Is it work/stress? Something medical? Is he coming down with something?
A final word. My DD is now 20 and her holidays revolve around her boyfriend and music festivals with her friends. Which is exactly how life should be when you're 20. But I find myself looking back with nostalgia at those simple family holidays.
Maybe start a thread on the Travel board and ask for recommendations for holiday destinations which are good for families but also good for exploring/sightseeing.