If the daffodils are looking past their best, dead-head them, but leave the foliage untouched. Better still, water the leaves with a weak general-purpose fertiliser.
Start weeding – anything which has taken root where it’s not welcome should be removed.
Mow the lawn when conditions allow. If that’s just not possible, trim the edges to keep things looking relatively tidy. Applying a combined moss killer/fertiliser will help green up the lawn and kill off unwanted plants.
Prune early-flowering shrubs; tie in shoots of rampant climbers; check the supports of trees and shrubs to make sure they are fit for purpose.
Keep an eye out for slugs and snails and deal with them before they become a major problem.