Hi bro, sorry if my answer is late, I hope it can help other tourists, I just came from this place and all my trips and activities in Yogyakarta were taken care of by Java Private Tour, I got recommendations from some of my colleagues at the embassy, ​​I admit the service is very good good, because of the recommendation from the embassy I don't doubt it, you can check it on tripadvisor about java private tour and also search it on google.

Hello Floridabluemacau. Just hire a private driver and ask him to bring you there or you can go on your own. For the admission, there's a registration counter where you pay for admission and tour fee which include with equipment rental (safety helmet,life jacket) for tubing activity,a local guide,and return off-road truck trip. There also photographer hire service if you want with extra charge that will take your photos along the trip. Hope this will help.

Ticket price is very reasonable.... about rp35,000 to rp45,000. Oh. Bring your own snacks and food. There are few food stalls around and being a remote place, err..... let's just say we only took cup noodles and canned drinks.

Jomblang and pindul caves are good! But don't go on a weekend, it gets quite crowded. It's about an hour away from the city but so worth it.

Yes, it is generally safe if the 65 year old is mobile and able to move around pretty much on his/her own. The operator will have guides to take you in and give you a brief highlight of the cave. It is pitch dark for a while but the guides have torchlights/flashlights.

The activity is basically relaxing since you just need to sit on a float and follow the river flow. The river was flowing very slow during my visit (early April). The tour organizer provided floating jacket and they accompanied us during the tubing. You will be wet as you enter the river. I personally consider it as a safe activity as long as you are in healthy condition and don't have any problem with the dark or claustrophobia. For a 65 year old, it will depend on his/her own health but I would suggest you to contact the tour organizer directly. Avoid weekend, holiday or high season so your trip can be more enjoyable.

prefer use semi shoe, they only provide lifejacket and wheel

Yes, no problem at all. The 2 year old sits on the lap of the adult.