Auf jeden Fall vormittags vor dem Ansturm der Reisebusse oder nachmittags, wenn diese wieder weg sind. Ich persönlich würde es am späten Nachmittag mit anschließenden Sundowner bzw. Abendessen im Beachclub Sandy Bay um die Ecke gleich beenden. Die fahren einen auf Nusa Lembongan mit einem Shuttle auch wieder kostenfrei zum Hotel zurück!

I would go around sunset time (between 5 and 6 pm) because the view will be amazing. But it will get a bit crowded so try to go there as early as possible.

Hello, we went from kuta by taxi to ferry port, taxi drop us off at ticket office of many boat companies, you can choose. We chose scoot but i regret later, because the boat was poor and the price was very high. It takes about 40-60min to get to the island, so you can easily come back the same day. Boat company also take you by their car wherever you want go (for free), after boat arrives to island, very convenient. Ps. Every bar/restaurant/spa also come to take you and then drop you off after (for free) if you call them and ask, so no problem, no need taxi there. So you need money only for boat around 500 round trip. No package needed i guess if you like to plan yourself

we paid 30,000 return including pick up from Ulluwatu and drop off at Kuta. we went with Scoot to go fast cat.

It's free to get up there but It's not on mainland Bali. It's a small island off Bali at Nusa Lembongan. Have to take a speed boat out for about 30 mins from Sanur.