I haven't been on many sun-holidays where I've just lounged all day by the sea or swimming pool. Not because I don't like them (I quite do actually), but because for the last few years I've spent my money elsewhere. But about ten years ago I went to Malta with three friends.
We spent most days by the swimming pool on the roof, but we wanted to do one excursion. We decided to go to Gozo, a small island just off the coast of Malta. I don't really recall what we did in the morning but during the afternoon we had a jeep drive and we went snorkeling.
I am not the best swimmer and when I first put the snorkel equipment on I thought I was going to drown! However, after first testing it in the dry (ie above water) and finding out I wasn't going to drown just yet if I went below the water, I went down and looked at amazing colourful fish. It was brilliant! I spent about half an hour just below the surface just enjoying all the life in the water, before we had to come out again and we continued our trip. Definitely not long enough!