Hi,
if remembering Fairy Caves and Wind Caves are just 15 minutes apart road journey.
From Ariva Gateway..that I had to google, it showed it will take close to 50minutes from city.
Then I went to Sarawak Foresty website,it shows Wind Caves operate only until 4:30pm...and since mid July is still the fasting month, they might close earlier.
Both these caves are close to Bau town.
One tip- bring your torch lights and fresh batteries,and really comfortable walking shoes with good grip..quite a flight of stairs which can be slippery too.
Are you planning to self drive? To reach,as mentioned is to approach Bau town, then I just whatsapp my friend in Kuching as she took me there ...once in Bau town, is to look for sign..saying Gua Kapur(I think it is spelt Kapor instead),then to know you are on right track,is to see sign Tasik Biru.
For both, better you start early in the day, so you have the time and pace in the cave to explore..otherwise it is just a rush and you do not get to enjoy the cave sights .
Now on the portable wifi router..handy has not made presence in Malaysia as yet.
Think the best,is to get a prepaid Malaysia SIM for your smartphone..and there are data package which you can subscribe to.