Brighton is on a busy trainline straight to London, as well as having good road links to the capital and across the south coast. It's easy to get down here for a weekend or holiday and it's easy to get into London or Eastbourne for a day out if you're living here. The only difficulty you might have is that everyone else has the same idea! It can get pretty busy and delays are common if you're travelling down for a summer weekend (especially bank holidays). Also, Southern Rail aren't known for their reliability, so if you want to be safer, get the Gatwick Express!