Galapagos recommendations

Hi everyone – we are looking to plan our honeymoon and are considering Galapagos or the Marquesas – my know French Polynesia very well but Galapagos not at all and I’d love for some help and advice: 1) is it better to go via a travel agent to book flights and a diving cruise? We are based in UK (anyone you’d recommend if so?) 2) for anyone who has been to Galapagos – would you recommend as honeymoon destination? 3) how long should we stay? We might have only 2 weeks of holiday (currently seeing if we can manage 3 weeks) 4) I’ve understood that a cruise is better than island hopping on land – is this true? 5) which cruise companies do you recommend and NOT recommend for a couple honeymoon who’s looking to enjoy amazing nature scenery, scuba diving and experiencing the local fauna on land but don’t want something super crowded with people either

Thanks so much amazing community!