First thing I would do is check the weather at the end of March/beg. April for places. You may find that lots of 'holiday destinations' may not be hot and sunny this early in the year.
Are you looking at European places?
Majorca is lovely - yes there are places on the island like Blackpool, but lots more places that are lovely and if you hire a car you can go inland to some fab villages.
I guess a lot of the late, cheap deals may be to areas of the Med which are very built up and 'English', this will be due to the large volume of hotel room that they are trying to fill.
Have fun looking though - as the previous post said, check out an agents. Just make sure they know the things that you want or don't want out of it, so they can recommend accordingly.