I really enjoy solo trips and always look forward to them. At the risk of appearing completely selfish, I just really enjoy planning a trip where I don't have to spend even a nanosecond considering the needs of others.

From SIN, some tips off the top of my head.

- departing from SIN, the baggage inspection is right before you enter the gate - so make an allowance for this.
- int'l, I'd probably give at least 2 hours on any connections; domestic in the US, 90 minutes should suffice.
- on such a long flight, if you're planning to sleep, the neck pillow is a great idea.
- go with a roller with a front side pocket, since many airports will mandate the removal of laptops or smaller bottles in bags (e.g., if connecting or transferring in Europe).
- noise cancelling headphones & download some music and/or ebooks you like.

Have a great trip! Personally, I'd probably check in a little early and enjoy SIN, airport of the year for 2023 according to some publication.