u/isalikesfood

me (19) and my boyfriend (18) are going to London for 7 days, we wil stay near the station of east croydon. since we are going to the centre of London a lot and also wanna visit the coast and maybe camebridge we are gonna use public transportation a lot! I saw some options online, but find it hard to decide which one is the cheapest. I thought about getting a 7 day zone 1-5 card, but I dont know if I need an oyster card or can get a paper ticket. I also saw a two together railcard for 1/3 off, or a card which can only be used to go from east Croydon to London.