April is the month when
Icmeler starts stirring into life. There will be a lot of activity to get bars, restaurants and hotels ready. The official season starts the first week of May however you will find that there will be some places open in April, I suppose it depends on what date you are coming? If it is early April then I doubt there will be much but there is always something open, you just might have to look a little harder or walk a bit further. There are places which are open now in the winter so you can always find something to do, but again it depends on what you want?
I like watching Icmeler springing into life and on a nice day just sitting drinking coffee in the cafe's near the heli pad - you can't beat it. The view just does it for me!
Weather-wise it's warm in the day (usually in the mid-top 20's) but will be chilly at nights and you will probably still get rain at times and spectacular thunder and lightning!
Of course you can always go into
Marmaris if you want a bit more life and it's still nice there in April before the tourist season really gets going. Sitting by the marina there is great for people watching!
If it's towards the end of April then obviously there will be more places open. I would say that April is a chill month for tourists (not for workers!) there may be some excursions going but
JT is the best to answer that one.
Chris