How to sit still and do nothing

So this weekend I spend, together with my boyfriend of course, huddled up in a sterrenkubus (cutest website ever!) or "starcube". They're really really small (compared to a house, of course, if you're used to camping like us then they're huge) and incredibly cute. They come with added telescope and a lot of information about astronomy and the universe and such, so it is a holiday home and stargazing-crash-course rolled into one. It was really cold this weekend, and we'd heard some stories about the cubes being very cold, but it was warm and toasty inside (wouldn't want to be there with -13 next weekend though!). And in the morning a biiiiig basked filled with more breakfast things than you could ever dream up was waiting outside, so life was good.
Now we both needed a bit of a break, so we had agreed to do very little; read some books, watch some movies, eat a lot of crap, sleep in, and that was it. All of this failed miserably. Somehow, we never get around to the "doing nothing" thing on holidays, we always fill our day to the max. So yesterday, we first drove to the village my boyfriend's father is from, to check out his old house, and then to Ootmarsum where we visited the local open-air museum, and then in search for lunch we stumbled upon the cutest little tearoom ever, the owner squeezed us in without a reservation, and we had some great British food with an even better view. And then we went to the local star observatory where we got into such a lengthy conversation with one of the volunteers that we left way after closing time. And then we had a great dinner in a nice bistro, and then we watched the first of the movies on the list, and then it was 12 o'clock. Wheeeere did that day go? Luckily enough the sky was overcast, or we would have been watching stars too!
How do other people do this? I mean, how do other people just go somewhere and read their books and watch their movies and go away again having done nothing but the things they planned on doing when they came there? Are they just that much more tired than we were? It's not that we feel that we need to do these things because otherwise our day would be wasted or anything, we enjoy doing them, we don't do them because others will think that we "did nothing" or anything. It just really puzzles me, how we seem to cram 20 things into 1 day and then come home even more exhausted than we left (not that we did this time, but our last summer holiday was pretty much like that). Are we just not exhausted enough to sit still, or is this normal holiday-behaviour? The last cannot be true, because there are people who book into a hotel and then spend 2 weeks laying next to the pool never knowing whether they are in Turkey or Spain. So I guess it must be us.
Not that I find any of this a problem, by the way, I am just musing (see title of blog) in my happy, relaxed, post-minibreak (to use a Bridget Jones term) bliss!