We went on a week-long trip to Cairns last month. I was 35 weeks. It was nice, but I was pretty uncomfy.
We just stayed with my sister, so no accommodation costs (except for a couple of nights up at the Tablelands where we stayed in pretty cheap accommodation). It was a nice break for us as a family, and DH got to spend some good quality time with DD which was important to me because they are going to be spending lots of time together when the little one comes and is permanently attached to my boobs
Anyway, I'd recommend it - even just what Taurean suggested: go on some dates