Hi
Are you planning on driving? Leitrim village is about a 8 minute drive from Carrick.
There's a nice B&B - Hollywell - in Carrick which might suit you better though. Leitrim Village itself is very small - there's a chinese, a chipper, a few pubs and a mace petrol station. Depending on your demographic, you might love it or hate it. If you're a bunch of girls/lads heading up, I'd recommend staying in Carrick - i'd recommend murtaghs as a good late bar and you can easily walk back to the B&B. However, if you just plan on shopping and taking it easy in the evenings - Leitrim could be for you.
by the way, there are taxis in Carrick so you wouldn't have a problem getting back to Leitrim Village either. But I know that Hollywell is a nice B&B, but I can't comment on the accomodation in the Leitrim Inn.
Let me know if you have any more questions/queries.
Have a great weekend anyway.