Great question! For students new to performing Shakespeare I like:
Demetrius and Helena from Midsummer (fun and physical)
Rosalind and Celia from As You Like It
Antipholus and Dromio of Syracuse from Comedy of Errors
Adriana and Lucetta from Comedy of Errors
Romeo and Juliet - their first meeting, maybe the balcony scene as well
Benedick and Beatrice - Much Ado
Ferdinand and Miranda - The Tempest
Petruchio and Katharine - Taming of the Shrew