Can I travel to Singapore on a 60-day Thailand visa and return without issues?

You can travel to Singapore with a 60-day visa for Thailand, but you need to obtain a re-entry permit to maintain your visa status upon returning. Alternatively, consider applying for a multi-entry tourist visa for more flexibility. It's important to note that the 60-day visa is a single entry, meaning exiting Thailand will typically invalidate the visa unless you have the re-entry permit.