We took our twins to Tenerife when they were 11 months and had a fab time. So many happy memories.
We went full board and so are in the hotel, but eating out would have been fine too. In my mind, if you have to make lunches or dinners and clear them up afterwards then it not a holiday! I didn't worry too much about the suitability of the restaurant food for the babies (though it was fine), as we took most of their food with us!
Our daily routine was to give the babies weetabix we'd taken with us when they woke up, so that we could potter and get ready at leisure without them being starving. Then we'd go down to breakfast, where the babies ate/played with yogurt/fruit/toast while we ate our breakfast.
Back to the room to change into swim stuff and pack for the pool, and then we all went for a swim. That wa generally enough to wear the babies out, so they would then sleep in the pushchairs for a couple of hours while we slept/read/swam.
We all ate lunch together in the restaurant, then went back to the room to freshen up and cool down away from the heat. Pottered and played in the room for an hour or so I guess. Then went out for a walk in the late afternoon, another swim, walk along the shore etc before going back to the room at 5pm ish to shower/bath everyone. Once clean, we fed the babies with Ella's pouches or similar (take a tupperwear box to fill from room kettle, submerge pouch for 10 mins until hot!) then got babies into pjs and us ready for dinner ourselves, had a G&T, watched the world go by from the balcony etc until 7 ish. Then we loaded the babies into the buggies with dummies/teddies/blanket etc and went for a walk along the beach, round the pool area etc until they fell asleep (took maybe 30 mins each night). Then we'd go for dinner, parking them in the corner.
Rinse and repeat each day!
When you describe each step like that it sounds like a busy day, but it was quite relaxing really. The babies were entertained by the new surroundings so didn't need much in the way of toys/occupying an I got a break from cooking and cleaning. I still had to wash baby bowls/cups/spoons, rinse clothes every few nights to keep the babies in clean outfits etc, but it was a hell of a lot easier than being at home and had the bonus of being sunny!
It won't be as relaxing as a pre-baby holiday, or course it won't. But you'll get time together as a family and will make lovely memories :)
We did broadly the same holiday (different place, same daily structure) again when they were 18 months and again when they were very nearly 2 years. Worked well every time. It's a good idea to bank some sun before they turn 2 years and need paying for!