I spent a few days in Swaziland doing an acclimatisation trek with my fellow World Challengers in 2007. Despite it technically being winter there, it was HOT (except at 6am in the morning when we got up every day, when it was freezing). Being a tiny country completely surrounded on all sides by South Africa, it didn't really feel any different to its much larger cousin, at least, as far as I remember (my travel journal for this trip seems to have hidden itself slash self-immolated, probably not for political/religious reasons).
Our crossing into Swaziland was fun, in that our truck broke down before we made it to the border and our driver had to be back in South Africa before nightfall and so on. After several hours playing rounders with water bottles for bats, some people from a nearby village arrived with tools and things, and the van was fixed - on we went.
The next day we acquired a guide at the Malolotja Nature Reserve, a friendly local guy (Zake) who taught us campfire games about washing powder, and began the trek, which involved hours crossing a lot of purposefully burnt out hilly fields which had a strangely berry-esque odour and crunched satisfyingly under hiking boots. Food was mostly macaroni (which we only accidentally cooked in meths once) and conversation generally took the form of show tunes and Disney songs sang at full volume, which somehow was less effort than generic talking.
- TRAIN - before you go. Do not eat all of the cake and do none of the training and then get annoyed at being the slowest. (This may have been me. It was me.)
- HIKE - it's the best way to see the stunning scenery and find secret waterfalls.
- AVOID IF - you're not a fan of finding snakes in rubbish bags or praying mantises on your tent.