How about a short trip to Ireland? This offer from Stena Line might be just the ticket, with fares from £49 per person return.
Applicable to their Cairnryan to Belfast, Liverpool to Belfast, Holyhead to Dublin and Fishguard to Rosslare routes, you can spend up to 28 hours in Ireland and still take advantage of this offer.
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If you've always fancied checking out Dublin or Belfast, this might be the excuse you were looking for.
Journey times are around 2 hours 15 minutes (Cairnryan to Belfast), 8 hours (Liverpool to Belfast; thankfully, overnight sailings are available!), 3 hours 15 minutes (Holyhead to Dublin), and 4 hours (Fishguard to Rosslare). Just make sure you select 'foot passenger' and ensure your travel times allow less than 28 hours in Ireland to unlock the special pricing.
This appears to be an ongoing offer, but may be withdrawn without notice.
The dull-but-necessary small print
All deals are subject to availability and can be withdrawn by the operator without prior notice. The lead-in prices (otherwise known as the 'from' prices) are, unless otherwise stated above, based on two adults sharing the cheapest available cabin on the cheapest available date. Typically the best prices are available at the start of any promotion period so the earlier you book the better choice of sailing dates and cabin availability you should have. Mid-week sail dates are likely to be cheaper than weekend sail dates.