One of the best ways to alienate your personnel is to maintain a sharp line between you and them when it's not necessary to do so.
If you have a team event, such as a lunch, try to keep it relaxed. You're not working, so let your guard down a bit, and talk about other things than work. Handled properly, this will not impact your role as boss; it will enhance it.
If there's some sort of crisis that requires the team to work hard in order to resolve it, or if there's a very tight deadline to be met, roll up your sleeves and get in there with them to pitch in. Don't say "It's not my job", and take off.
Don't dump work. Delegate responsibly and appropriately. If there's some task that your team is responsible for but that no one likes, ...