Bali is nice. I would say make your way out of Kuta asap unless you like beer and McDonalds food and everything that comes with it.
Ubud was good, but so, so busy with tourists. Definitely worth a few days though. Hiring a scooter is good but be sure you have an international driving licence. We got 'fined' by the traffic cops despite my UK licence showing I can legally ride a motorbike. To be honest, I think they'd have managed to find a way to extract some money from us no matter what paperwork we had. Just how things work there
Lombok is a bit less developed that Bali. There were fewer tourists when we went. We stayed for a few days and then went to the Gili Isles. We went to the quietest one (Air?) You literally have to wade ashore with your bags off a little boat. It was totally idyllic with incredible beaches and the most amazing snorkelling i have ever seen. Unfortunately my girlfriend contracted Dengue Fever so we had to rush back to Bali to get blood tests and make sure there were no complications. There comes a point where it seems pointless trying to avoid mosquitoes, but honestly, it's better if you don't get bitten! I hope we'll be able to go back to the Gilis at some point and spend more time there.
Indonesia is a beautiful and amazing country and the people are lovely. For anyone who loves nature and scenery, it's a great destination. It sometimes takes a bit of effort to get away from the crowds, but it is worth it when you do.
I spent three weeks in HK with work two years ago and loved it. I considered looking into moving there for a bit cos I was so taken with it. In 24 hours it'll be a case of staying in a fairly small area. But I'd say the tram up to the peak is worth it, taking the escalators up and down the middle levels, interesting architecture, nightlife in Wan Chai, taking a ferry over to the Kowloon side. The nightly light show on the Kowloon side is pretty cheesy but worth a watch if you're in the area. I definitely preferred HK island to Kowloon which mostly seems to be huge shopping centres and high end stores.
The best thing about HK for me though is just walking the streets and looking around. You can be walking down a huge avenue with the head office skyscrapers of international banks in front of you, then turn down a narrow alley and there be tiny little market stalls or strange little shops whixh look like theyve been there forever. For me, how these worlds co exist in very close quartets is one of the things that makes Hong Kong so interesting.